Do Won and Seo Kyung both lose their fathers on the same night 12 years ago. In the present day, Do Won is a police officer and Seo Kyung a prosecutor. The police discover several skeletons on the train tracks at Mukyeong Station, which has been closed for five years. Do Won heads to the station while chasing a key suspect.

A lawyer is given the mission of revitalising a bankrupt zoo that has no animals. When he and a group of zookeepers come up with the idea to dress like animals and his fake polar bear goes viral, the zoo becomes a hit, before his law firm’s real intentions are revealed.