Hello Monster

2015 • TMDB 7.3 • 1 season • 16 episodes • Mystery, Drama • KBS2

Where to Watch

In the US, Hello Monster streams on Rakuten Viki, with 1 season. Availability checked against US listings on October 29, 2026.

Overview

Also known as I Remember You, Hello Monster pairs a brilliant but emotionally guarded detective with a criminal profiler who seems to know his past better than he does. Lee Hyun reads crime scenes the way others read faces, yet his own childhood memories remain a blank — until Cha Ji-an, a police detective with a personal stake in an old case, returns to his orbit. As the two work together, a string of unsettling murders forces them to confront a shared history neither fully understands. Park Bo-gum’s quietly menacing turn as a figure from Lee Hyun’s past adds a layer of unease to every encounter, while the investigation itself stays taut and methodical. Beneath the procedural machinery, the series is really about identity: how childhood wounds shape adults, and whether understanding a monster’s mind means recognizing something of yourself in it.

Creator and Main Cast

Hello Monster was created by Kwon Ki-young. The main cast includes:

• Seo In-guk as Lee Hyun (16 episodes)
• Jang Na-ra as Cha Ji-an (16 episodes)
• Park Bo-gum as Jung Sun-ho/Lee Min (16 episodes)
• Lee Chun-hee as Kang Eun-hyuk (16 episodes)
• Choi Won-young as Lee Joon-ho/Lee Joon-yeong (16 episodes)
• Im Ji-eun as Hyun Ji-soo (16 episodes)
• Min Sung-wook as Son Myung-woo (16 episodes)

Seasons Snapshot

• Season 1 — 16 episodes (2015)

Why Watch Hello Monster?

• A profiler-versus-killer premise built around psychology rather than spectacle.
• Seo In-guk and Jang Na-ra make an unusually prickly, compelling investigative duo.
• Park Bo-gum’s early breakout role is chilling precisely because it is so restrained.
• A childhood mystery that reframes each new case as it slowly unfolds.
• A complete, tightly plotted 16-episode story with a satisfying ending.

Trailer

Watch the official teaser on YouTube: KBS World (Ch 559) – “Hello Monster” Teaser (Now TV)