Kim Se-yeon

Hyun-jae, a 16-year-old escaping her abusive father, manipulates Hae-in, a woman searching for her missing daughter, into taking her in as a replacement. Over the summer, Hyun-jae bonds with Hae-in, finding peace through her love for singing, but becomes obsessed with becoming Hae-in's new daughter. When Hae-in learns her missing daughter may have been found, Hyun-jae, despite her fears, makes a selfless decision to accompany her, realizing she can't replace Yun-seul.

An inspector from the Educational Rights Protection Bureau (ERPB) who is authorized by the government to use physical intervention and unconventional methods to discipline delinquent students and reform the educational system.

Once the founder of Tae Sung Bio and now hiding as a cleaner, Park Chang-wook is pushed out by his son under pressure from his wife and mother-in-law. His life takes a turn when he saves Jia and later marries her mother, Se-yeon. Framed for a fake painting, Se-yeon faces bankruptcy. Chang-wook steps in with a genuine artwork but is branded a thief. As Se-yeon defends him, his true identity emerges.

Songwon Police Violent Crimes Unit 2 has the lowest arrest rate in the country. After their chief is demoted, the team is exiled to a closed daycare center. Enter Yubin, their new leader. Despite the team's initial distrust, Yubin and the team start to bond as they solve cases together.

After life's ups and downs, a loving couple separated by death reunites in heaven — only to discover he's in his thirties while she's in her eighties.