Love is For the Dogs, Secrets of the Past

A lawyer, Aiko, and a veterinarian, Kai, meet while walking their dogs, which are instantly drawn to each other. Meanwhile, a Korean chaebol heir, Soha, arrives in Japan with a purpose.

Soha claims Kai's dog is his, and Aiko, as a lawyer, tries to find a legal way for Kai to keep the dog. To gain her trust, Soha takes Aiko on a date in Yokohama.

Kai's dog is suddenly kidnapped. He suspects Soha, who denies any involvement. Aiko reveals to Kai that they share a past connection involving a stray dog from their childhood.

Kai reluctantly agrees to live with Soha. At work, Aiko finds herself in a difficult position, forced to legally oppose Kai over the ownership of his dog due to her boss's decision.

An old friend returns with a shocking offer for Kai, bringing back a dark past. Tasked to investigate Soha, Aiko instead learns Kai's secrets.

Aiko's confession leaves Kai confused. A new rival emerges as Soha's sister arrives, confesses to Kai, and vets Soha for the family succession.

Aiko is bewildered after Soha confesses his feelings for her. Aiko's mother, who is consulting her about a divorce, invites both Kai and Soha to dinner, leading to a tense meal.

After Aiko's impulsive kiss with Kai, things are awkward. Soha selflessly pushes them closer. As they finally discuss the kiss, a crisis hits Kai.

Guilt-ridden over Kai's crisis, Soha flees to Korea and rejects their pleas. Aiko's subsequent attempt to uncover the truth backfires, putting her own career in jeopardy.

Soha returns with evidence, uniting the trio for a final battle. As he plans to propose to Aiko, Kai makes the heartbreaking choice to support his friend over his own feelings.