Kong Ji Hyeok works as the leader of the Mother TF team at a baby products company. He is sharp, calm, and executes passionately. One day, a team member, Ko Da Rim, suddenly kisses him. This places him in a difficult position because she is a married woman. Meanwhile, Ko Da Rim is a single woman who needs a job to support herself. She gets a job as a temporary employee at the baby products company where Kong Ji Hyeok works. She lies about her background and states she is married with a child to get hired there. She now works under Kong Ji Hyeok on the Mother TF team. Her only interest is to become a permanent employee there, but she begins to have feelings for Kong Ji Hyeok.
Ahead of her sister's wedding, Ko Da Rim heads to Jeju Island, where a sudden encounter leaves her reeling — until she meets Kong Ji Hyeok by a cliff.
As their ruse turns into a real spark, Da Rim and Ji Hyeok go on an actual date. Meanwhile, Da Rim's mother collapses after a shocking confrontation.
Da-rim and Ji-hyeok's unexpected reunion at work takes a tense turn when he learns of her "marriage" — becoming a ruthless boss as punishment.
A tense escape from loan sharks brings Ji-hyeok and Da-rim closer, reigniting their spark. Later, Da-rim makes a heartfelt plea to keep her job.
After Ji-hyeok pays off Da-rim's debt, he starts meddling in every part of her life — leaving her torn between frustration and affection.
After witnessing Kim Seon-u's apparent romantic rendezvous with Yu Ha-yeong, Ji-hyeok debates telling Da-rim while caring for Da-rim during her illness.
Ji-hyeok and Da-rim's bond deepens as they team up at a company event for newlyweds. Later, Da-rim falls in the mountain amid an unexpected crisis.
News of Ji-hyeok's engagement shocks Da-rim — and his coldness only deepens the hurt. A company trip soon forces them back into close proximity.
When Ji-hyeok learns the truth about Da-rim, he feels relieved yet deceived — and his unpredictable behavior pushes her to confess everything.
Da-rim grows wary of Ji-hyeok's constant affection. Later, when their mothers gather at Seon-u's home, Ji-hyeok's competitive streak flares up.
After a confession, Ji-hyeok and Da-rim begin a secret romance — but not without close calls. Meanwhile, someone at work learns that Da-rim is unmarried.
Racked with guilt, Da-rim decides to resign — but Ji-hyeok won't let her go. When a colleague catches their affection, Da-rim decides to tell the truth.
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