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.

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

  • Seo In-guk as Lee Hyun / David Lee
  • *Hong Hyun-taek as young Lee Hyun
  • Jang Na-ra as Cha Ji-an
  • * Park Ji-so as young Cha Ji-an
  • Choi Won-young as Lee Joon-ho / Lee Joon-young
  • *Doh Kyung-soo as teen Lee Joon-young
  • Park Bo-gum as Jung Sun-ho / Lee Min
  • *Hong Eun-taek as young Lee Min

    Supporting

  • Lee Chun-hee as Kang Eun-hyuk
  • Min Sung-wook as Son Myung-woo
  • Kim Jae-young as Min Seung-joo
  • Son Seung-won as Choi Eun-bok
  • Im Ji-eun as Hyun Ji-soo
  • Nam Kyung-eup as Kang Seok-joo
  • Lee Bom as Joon-ho's mother

    Production

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

Reception

Critical response

'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.

  • Awards and nominations

International broadcast