Hello Monster


Hello Monster is a South Korean television series starring Seo In-guk, Jang Na-ra, Choi Won-young, and Park Bo-gum. It aired on KBS2 from June 22 to August 11, 2015 every Monday and Tuesday at 21:55 for 16 episodes. Park's performance was widely praised by audience and critics and won him the Best Supporting Actor Award and Popularity Award at the 29th KBS Drama Awards.
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Synopsis

Genius profiler Lee Hyun, returns home to Korea after something from a case he has been sent triggers a memory he thought he had lost forever. Unbeknownst to him, one of his team members, Detective Cha Ji-an, has been investigating him for some time. She is aware that his father was murdered and his brother disappeared under mysterious circumstances involving a criminal named Lee Joon Young whom they both want found and incarcerated. Each seeks to unravel the other, unaware that they've been drawn into a dangerous game of cat and mouse by a master player and that both truth and evil are closer and far more twisted than they think.

Cast

Main

Supporting

Production

The first script reading took place in the end of April 2015 at KBS Annex in Yeouido, Seoul, South Korea.

Reception

Critical response

Park Bo-gum's performance received widespread critical and audience acclaim and won him the Best Supporting Actor Award and Popularity Award at the 29th KBS Drama Awards. In 2025, in a career retrospective for Park, Gulf News stated that Park's performance in the series was "his best role yet in a stellar career... proving his ability to shape-shift into what the role demanded—even if the show wasn't always a hit, Bo-gum always was."

Viewership

In this table, represent the lowest ratings and represent the highest ratings.
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