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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.

After being forced to admit she was spying, Da-rim says goodbye to Ji-hyeok before disappearing. Heartbroken, he focuses on clearing her name.

Ji-hyeok makes his final move to take down his foes, but a vengeful act puts him in danger and erases his memory. Can he and Da-rim find happiness?