when does alison come back into pretty little liars

Five years ago, Nina Wade was betrayed by her own family, leading to an unexpected pregnancy with Joe Holt. She raised their son, Ben, in secret. But now, five years later, her world is shattered when Ben is diagnosed with leukemia. Desperate to save him, Nina plans to sell the precious jade that Joe left to her back then. Meanwhile, the Holts begin a city-wide search for Ben. In the midst of this chaos, Nina finds herself working as Joe's secretary at Holt Corp. As they spend more time together, their relationship begins to heat up in ways neither of them expected.

Frank Chavez, the richest man's son and the Dragon Temple's owner, works as a chauffeur and a fruit vendor. 5 years ago, Frank saved Helena Solis, and they had sex. Now, she and their daughter Eve have found Frank, so he decides to make it up to them. But Eve has heart disease due to a genetic mutation and can't walk. Only the drug Helena has been developing might cure Eve.Helena's stepmother and stepbrother sabotage her efforts and even force her to sleep with the Larson family's young master. Frank repeatedly saves Helena. With Master Giles and the 10 Major Medical Laboratories' help, Eve's illness is cured. Helena's stepmother and stepbrother are punished. The Larson family's and the Dark Alliance's plan is destroyed. In the end, Frank reunites with his father, Helena has a second baby, and the whole family lives happily.

Due to a string of misfortune, Summer was set up by her step sister which resulted in her getting pregnant. This was four years ago and when she returned home, she had twins and recognized the mask wearing Sean as the father of her children. However, little did she know that the man was also her boss

To investigate his mother's death, Jose Lynch went undercover as a taxi driver.He had a one-night stand with CEO Sherly Shawna. Years later, she returned with their daughter Celeste, proposing marriage so she could focus on saving her failing company.Jose cared deeply for Celeste and promised to protect her. When Sherly's parents locked the asthmatic girl in a room during an attack, Jose arrived just in time to save her.Later, Jose's billionaire father learned about his granddaughter and hosted a charity banquet to meet her. But Sherly was humiliated by her arranged fiancé from the Jackson family...

Jessica, a struggling single mother who loses her daughter, Lola, to child services. ​ Years later, she unknowingly marries billionaire James Parker, Zoe's adoptive father. As secrets unravel, Jessica discovers Zoe is her long-lost daughter. Together, they overcome betrayal, threats, and heartbreak to reunite as a loving family.

Daria Carter, a single mother, embarked on the journey back home with her twins, Milo and Myla, for their education. To her surprise, they unexpectedly crossed paths with William Shaw, with whom Daria had a romantic fling five years prior. Upon recognizing Daria, William chose to conceal his identity, assuming the guise of a prodigal son to establish a connection with her. As their friendship unfolded amidst various challenges, marked by moments of sweetness, William found himself increasingly drawn to Daria. Simultaneously, Daria eventually discovered that William was the father of her beloved twins. In the end, love bloomed between them, leading to the formation of a complete and harmonious family unit, embracing the joyous presence of Milo and Myla.

Kang Do-hyun chooses an ordinary life as a taxi driver to avoid inheriting his father’s family business. One day, he happens to rescue Cha Eun-seol, who is fleeing a chase and has accidentally taken the wrong medication. After a one-night encounter, they part ways and return to their separate lives. Four years later, a stylish CEO shows up with a child and proposes marriage to Do-hyun. After registering their marriage, Eun-seol faces pressure from her parents to abandon the child, but Do-hyun appears and protects both mother and daughter. As her company falls into crisis, Eun-seol attends a family banquet of Taegang Group—the most powerful conglomerate in Country A—to secure a 10-billion-won investment, unaware that the chairman is actually her husband’s father. At the banquet, despite pressure from her former fiancé Gu Jung-tae, Do-hyun’s father protects his granddaughter Kang Rumi and makes his presence known, yet he can only approach her as a “grandfather” without revealing his true identity. As time passes, Do-hyun and Eun-seol grow closer. However, after failing to secure investment, Eun-seol risks both her company and her board position by making a dangerous bet with her father, Cha Myung-hwan. At this critical moment, Do-hyun seeks out his father, accepts the responsibility of becoming the heir, and begins to take action himself. In the end, at a press conference, the capital and influence Do-hyun has prepared turn the situation around. Eun-seol not only saves her company but also secures full ownership, achieving both love and success.

Escaping from a pervert trying to buy her virginity, Julia kisses a stranger—Stephen, a billionaire who’s allergic to women. Years after their one-night stand, Julia returns with his child. But what she doesn’t know is that Stephen has been searching for them all along: the only woman he isn’t allergic to...and his child.

An accident leaves Lina pregnant with the Harrington CEO’s baby, but her newborn son is taken from her. Years later, she becomes a cleaner at the Harrington Group to find him—only to meet her son, Lucas, on her very first day. And when Madam Harrington chooses Lina as her future daughter-in-law, Lina’s life changes overnight.

Five years ago, after a night of drinking, Sylvia Snow accidentally stumbled into the wrong room and spent a passionate night with a man she didn't know—Eric Payne. That night led to the birth of their son, Noel Snow. When Noel turns four, he starts showing strange symptoms and is locked away, treated like a monster. Just when things seem hopeless, Eric shows up and saves Noel. Sylvia soon discovers that the man from that night isn't just any man—he’s a legendary werewolf, and the secret behind their son's condition is far more extraordinary than she ever imagined.

Seven years after his beloved passed away,Charlie Lucas, a wealthy tycoon, meets a homeless mental woman who looks just like his late lover and has the same ring as his. Thinking her and her daughter, Rocco, as frauds, he abused them and drove them away—until a DNA test reveals Rocco is his own daughter. Buried secrets start to reemerge...

Seven years ago, a night of passion entwined Evelyn with GT CEO Xavier. Now a single mother, Evelyn seeks a father for her son William and to escape a twisted teacher, Richard. When she rescues Xavier's mother from an attack, she enters a contract marriage with him—unaware he is the man from that night and William's biological father. As school bullying, Richard's revenge, and dark family secrets emerge, Xavier's true identity is on the verge of being exposed.

When college student Chloe Fawn discovers she's pregnant, she's determined to raise her baby alone, until she learns the father's shocking identity: Ethan Toll, the domineering CEO of Sunnix Group! This powerful billionaire storms into her quiet life like a force of nature, refusing to let her go and showering her with love beyond her wildest dreams!

To reclaim her late mother's estate, Sienna Reed ends up spending a night with Adrian Voss, the Alpha of the werewolf pack. Three days later, she discovers she's pregnant. Four years on, they cross paths again. This time, she has two wolf pups by her side. She runs. He hunts. There's no escaping him. Just when she's convinced he despises her, he turns around and spoils her like she's the only thing that matters.

Once a wealthy heiress, Stella Smith's life takes a tragic turn when her parents become comatose after an accident, and her fiancé betrays her. By a twist of fate, she is pregnant with Jay Pace's child, though she mistakenly believes the father is someone else. Years later, she returns with her child and reunites with Jay Pace as his subordinate, totally unaware that her boss is actually the father of her child. A series of misunderstandings ensue which sparks a growing affection between the two. As the misunderstanding clears up, the reunited family finds their happily ever after.

For three years, Cecilia Nixon had been in a loveless marriage with Nat Gold, untouched by him, and her mother-in-law insisted she leave empty-handed. In a sudden act of defiance, Cecilia managed to force Nat to sleep with her and then vanished, pregnant. Six years later, upon her return to her homeland, the first person she bumped into was Nat. As they engaged in a chase, her rage got the better of her, and she confronted him, demanding a proper distance between them.

Eight years ago, Anna Lane, a D-list actress, married Caleb Scott, CEO of Scott Group, to fulfill her grandfather's wish. After unexpectedly becoming pregnant, she filed for divorce. Six years later, the Scott family discovers that her daughter, Nancy, is actually Caleb's child and begins searching for them. While Anna faces mistreatment on a film set, Caleb arrives to rescue them but doesn't recognize his daughter. At a banquet, Caleb's mother reveals Nancy's identity, and the truth comes out: Anna is Caleb's ex-wife. Caleb confesses his love, and they remarry, welcoming twins and achieving both love and career success.

Six years ago, after Elena was pushed into the sea, she was saved by the Dragon King, Yale, had a one-night stand with him, and gave birth to a pair of twins. One of the twins, Tina, was raised by Elena, and the other one, Minnie, was taken away by Yale. Six years later, Elena started to look for Tina's father to treat Tina's disease. After all the misunderstandings due to Tina and Minnie's identical looks, Yale and Elena finally uncovered the truth and confessed their love to each other...