Pyeon Sang Wook and
Go Min Si as
Lee Eun Yoo. Neither of the characters is a hero by any measure, but they’re all forced to step up for the sake of various personal motives.
Song Kang plays Cha Hyun Soo with a genius subtlety that even veteran actors wouldn’t be able to pull off. He imbues the character with just the right lack of vivacity that sets him up for the grand finale, which is implied at the very beginning of the series. Cha Hyun Soo is a complete recluse, a
hikikomori, who, through the course of the series, fights with his inner desire to live and/or die. He is constantly on the precipice of losing his humanity while also trying his hardest to retain it. It takes immense strength for someone like him, who has suffered from such damaging mental health problems that have led him to self-harm, to step up for his own self and his own life and ask to be saved. Cha Hyun Soo is averse to the world, but he can’t bear to see it end. With this brilliant portrayal of Chan Hyun Soo, Song Kang has officially cemented his position as one of the industry's best actors, without a doubt. The complexity, the struggle, both inner and outer, the helplessness and the sacrificial surrender of Cha Hyun Soo was not a job that any other actor could have fulfilled.