Um Tae Goo

The series follows the story of a group of strangers who are all having a hard time processing a horrible experience from their past. Each of them is going about their normal lives when they are all strangely pulled to a light shop located at the end of a dubious alleyway. A cautious shopkeeper guards the light shop, which may contain the key to the strangers' pasts, present, and futures. (Source: Wikipedia) ~~ Adapted from the webtoon "Shop of the Lamp" (조명가게) by Kang Full (강풀).

In 1999, a recording tape containing a mysterious serial murder and an eerie sound is discovered in a rural town. In 1987, terrorist Jo Gyeong Ho released sarin gas at a train station, killing passengers before turning himself in. His daughter, Jo Jae Yeong, was sent to live with his younger sister, Jo Jeong Hyeon. A decade later, Detective Choi Hyeong investigates a murder case he suspects is linked to the past attack. When Jeong Hyeon's niece goes missing, she joins Choi Hyeong to uncover the truth and save her. (Source: MyDramaList)

Seo Ji Hwan, once a legend of the underworld, is CEO of a food company that offers a fresh start to ex-convicts. His gangland past, though, has a tendency to follow him even after retirement. His personal history is murky and he has no known vices. Go Eun Ha, known as "Sister Mini" to her web channel's mini audience, is a popular but struggling children's entertainer. She does her best to make children happy with no strings attached. Eun Ha's show is inspired by memories of her childhood companion, Hyeon U. After a series of embarrassing, comical, and painful misunderstandings Ji Hwan and Eun Ha begin to get to know and understand each other. Jang Hyeon U has fulfilled his ambition of becoming a prosecutor but is also a grown-up fan of Sister Mini. He is suspicious of Ji Hwan's past and actions and is uneasy about Eun Ha's relationship with him. The three cross paths as they pursue the truth about a missing ex-con and encounter Ji Hwan's rival gang. (Source: isang18 at MyDramaList) ~~ Adapted from the web novel "A Woman Who Plays" (놀아주는 여자) by Park Soo Jung (박수정) a.k.a. Bangulmama (방울마마).