

Joseph, heir of a top-tier family, is forced by his grandfather—who threatens to kill himself—to agree to marry the eldest daughter of the Smith family. But Joseph refuses to marry a stranger. Determined to choose for himself, he changes his name, goes undercover as a nanny in the Smith household, and sets out to evaluate the looks and character of the family's four daughters.

On their fifth anniversary, Emily discovers that she has merely been a “stand-in” for her boyfriend’s first love, Evelyn. Emily immediately breaks up with Ethan and returns to her old life as an up-and-coming researcher. Having long concealed her status as a brilliant scientist, she earns the support of Daniel, the youngest professor at a prestigious university, and ranks first in gaining admission to the PhD program under her dream advisor. Through hard work and resilience, Emily proves her worth to others and simultaneously exposes the carefully constructed persona that Evelyn built for herself. Only then does David realize exactly what Emily is truly capable of, as well as the love she poured into their relationship, leaving him filled with nothing but deep regret as he watches her flourish in her newly reclaimed life.

Quila Yale, a double-award-winning actress, unexpectedly transmigrates into the role of the wicked stepmother, Lena Yale, from a show she once starred in.When a little kindness toward her stepchildren unexpectedly activates the "Mom's the Best System", she's able to provide lavish meals even during a famine. Through shared hardships, the children's suspicion turns into genuine love, finally seeing her as their true mother. By the time their father, the general, returns from war, this family is finally whole again.