when does the merger happen in grey's anatomy

ER doctor Kate Reed believes she has a loving marriage—until one phone call shatters the illusion. While she's in surgery, her husband Mason Fadley claims his flight is canceled, but he's secretly with his sister-in-law, Sandy Young. When Mason collapses from expired drugs, Kate uncovers the affair—and learns her miscarriage was their doing. On Sandy's wedding day, Kate doesn't arrive to celebrate. She comes to expose their sins.

Three years later, when they reunited, Donna's first words to Henry were: "Mr. Ferrell, let's have a fake marriage."Having been deceived out of her fortune by the boyfriend she had supported for years, Donna finally realized the price she had paid. Well, if that's the case, she'd just switch to a different man.At the civil affairs office, Henry grabbed her arm tightly: "I never said I wouldn't agree."

Lydia Nott's mother-in-law falls gravely ill, but Ian Hart, mistakenly thinking the ambulance is for Lydia's ex-boyfriend, blocks its path. At the hospital, he refuses to donate blood and even destroys the blood source needed for the rescue. Despite Lydia's efforts to find help, her mother-in-law dies. Ian skips the memorial to attend Ivy Scott's birthday, only to learn the truth too late. When he tries to expel Lydia from the Hart family, he discovers she's the rightful heir. Stricken with guilt over his mother's death, he is left to face the consequences of his actions.

George, the heir to a wealthy family, was saved by Melody when they were children. He gave her a lucky necklace and promised to find her when they grew up and repay the favor. After years of searching in vain, George marries a woman with a crippled leg. He lets others bully her, even causing her to miss her mother's last moments. She asks for a divorce, and George discovers too late that she was Melody all along. Realizing how badly he treated her, George decides to get her back. But Melody also runs into trouble when she goes back to her father who always disliked her, and her tormenting stepmother and stepsister. Will Melody be able to get back what she deserves?

When heartbroken travelers Eileen and Leon cross paths amidst betrayal and rejection from their own relationships, a tipsy encounter leads to a night of unexpected passion. What starts as a drunken fling seems to be fading away once their journeys end. Howver, fate has other plans as Leon becomes Eileen's unlikely guardian angel, appearing whenever she faces a crisis. Eileen discovers she's carrying Leon's child and the two decides to give their romance a shot. But Leon's ex, Molly, reenters the picture... Will she be the wrecking ball that shatters their new romance, or the catalyst for discovering true love?

Hollywood superstar Judy's wedding of the century takes a scandalous turn, when her cheating groom's sex tape is leaked to millions of livestream viewers. Is it an accident, or is there a puppeteer pulling the strings? A young showbiz mogul, George, mistaken for a gigolo by Judy, spends a wild night with her and pledges to become her agent. Is that true love blossoming in La La Land, or is there some sinister agenda at play?

Bryanna's poor boyfriend cheated on her with her best friend and plotted to sell her to human traffickers. However, fate intervenes when Bryanna mistakenly marries the company's CEO instead of the old man... With a marriage at hand and a grandmother pushing for blind dates, the CEO decides to make the best of it by marrying Bryanna. Initially a transaction of convenience, however, later both of them unexpectedly invest their true feelings...

Vera Nelson has spent three years as a devoted wife, supporting her husband Jason Ford's rise as a star lawyer. But when his first love, Nia Jones, returns, he begins to neglect Vera's feelings, and distance grows between them. Once a brilliant lawyer herself,Vera quietly walks away and returns to the legal world.When she rises to fame again, Jason finally realizes the legend he's long admired is the very woman who once gave up everything for him.

Sylvia Hansen was raised in isolation on a mountain, training in martial arts and unaware of modern society's customs. When her master sends her down to marry, claiming it will boost her powers, she believes "sleeping together" simply means resting beside her husband. It's only after meeting the male lead and facing a series of hilarious misunderstandings that she discovers "sleeping together" can actually result in a baby!

Rachel Sheldon's world was turned upside down when she was drugged and woke up in the bed of Barrett York — the most powerful man in the city. When she discovered she was pregnant, Rachel disappeared from the spotlight, determined to raise the child in secrecy. But on the very day she gave birth, Barrett found her. Fiercely independent, Rachel was unlike any woman Barrett had ever met — and he couldn't stay away. As he launched a relentless pursuit, Rachel's hidden identities were revealed one after another, each more surprising than the last. Drawn to her strength, Barrett began to fall — and so did Rachel. Slowly, she opened her heart to the man she had once tried to escape. What had begun as an accident just might have become forever.

Three years later, when they reunited, Donna's first words to Henry were: "Mr. Ferrell, let's have a fake marriage."Having been deceived out of her fortune by the boyfriend she had supported for years, Donna finally realized the price she had paid. Well, if that's the case, she'd just switch to a different man.At the civil affairs office, Henry grabbed her arm tightly: "I never said I wouldn't agree."

Bryanna's poor boyfriend cheated on her with her best friend and plotted to sell her to human traffickers. However, fate intervenes when Bryanna mistakenly marries the company's CEO instead of the old man... With a marriage at hand and a grandmother pushing for blind dates, the CEO decides to make the best of it by marrying Bryanna. Initially a transaction of convenience, however, later both of them unexpectedly invest their true feelings...

Ten years ago, Flainn emerged as the champion of the Global Forging Contest but became infamous after the mysterious death of his master, Dashiel. Living in obscurity, his life takes a turn when Dashiel's daughter, Maryln, seeks his help to restore her father's Dragon Sword for an upcoming competition. Reluctantly agreeing,Flainn risks exposure as his extraordinary skills are revealed during the forging process.

Betrayed by her stepbrother Edward and left to die with nothing but regrets, Celeste Welsh gets a second shot at life. This time? She's playing for keeps. Revenge against Edward is at the top of her list—but things get complicated when love unexpectedly walks in. Now, she's juggling payback and passion, determined to live this life with no regrets. Sweet, fierce, and unstoppable, Celeste is rewriting her story…

One day, while feeding fish, Yvette accidentally fell into the pond and discovered a life-shattering truth: She had no blood relation with her parents or her five brothers. She was nothing but the Stewart family's false heiress! Faced with the certainty of losing everything, Yvette decided to stop struggling altogether and just enjoy life before being kicked out. But when Harriet, the true heiress, finally returned, her brothers shielded Yvette behind them, pleading, "Harriet, let her stay.She's... not exactly sharp. It's too dangerous for her out there aloneOne day, while feeding fish, Yvette accidentally fell into the pond and discovered a life-shattering truth: She had no blood relation with her parents or her five brothers. She was nothing but the Stewart family's false heiress! Faced with the certainty of losing everything,Yvette decided to stop struggling altogether and just enjoy life before being kicked out. But when Harriet, the true heiress, finally returned, her brothers shielded Yvette behind them, pleading,"Harriet,let her stay.She's... not exactly sharp. It's too dangerous for her out there alone."

Yulia's parents forced her to marry John Hooper for money. She suffered from domestic violence for years, got serious injuries many times, and ended up in hospital. When the violence involved her daughter, Yulia decided to fight back.

Six years ago, Alyssa Moss lost her voice in a car accident and was led to believe that her husband, Caleb Wood, had cheated on her with Mandy Shaw. Crushed and betrayed, she faked her death and disappeared. Now, she returns as Anna, a renowned architect, with her son, Connor Wood. But when she unexpectedly crosses paths with Caleb and Mandy, she must hide Connor's true identity. When Connor is kidnapped, Alyssa and Caleb join forces to rescue him—only to discover that every lie and heartbreak between them had been orchestrated by Mandy all along.

To settle her father's debt, Vivian Gray reluctantly accepts Shane Ford's offer of 200,000 dollars to become his wife. On the day they register their marriage, both disguise themselves, unwilling to reveal their true identities. A year later, while working as a hostess at a film festival, Vivian accidentally trips and falls, unintentionally stealing Shane's first kiss. "Get off me!" Shane snaps angrily. "I'm sorry, but... your lips are so soft!" Vivian blurts out. The incident costs Vivian her job, and fate takes a surprising turn when she ends up becoming Shane's assistant.