The Kidnapping Day

Myeong-jun accepts his ex-wife Hye-eun's proposal to kidnap an 11-year-old girl named Ro-hee to pay for his daughter's hospital bills. En route to execute his plan, someone collapses before his car, which turns out to be Ro-hee. He takes her home, but she can't remember anything when she wakes up. Myeong-jun claims to be her dad and contacts her parents for the ransom, but they can't be reached.

Myeong-jun and Ro-hee stay the night at Hye-eun's house, the mastermind behind the kidnapping. Ro-hee is in disbelief when she discovers Myeong-jun's decision to take all the blame for kidnapping her. Ro-hee remains suspicious of Hye-eun and, in the end, finds out the real reason for Hye-eun leaving Myeong-jun and Hee-ae. Meanwhile, Sang-yun finally faces Myeong-jun after an unyielding pursuit.

Myeong-jun and Ro-hee find themselves in Choi Jin-tae's villa. Myeong-jun learns of "The Genius Child Project," a brain experiment Ro-hee was a subject in. Dr. Mo attempts to separate Ro-hee and Myeong-jun. Meanwhile, Sang-yun digs into a case from 30 years ago to catch the culprit of the hospital director and his wife's murder case and hears an unexpected name from a witness of a past case.