Isang boksingero si Yujin Perez. Pinapangarap niya na maging Olympic Gold medalist habang tinutuloy niya ang kaniyang pag-aaral. Pag-aaral lang naman at boxing ang inaatupag niya since junior high school. Binigyan siya ng Coach niya na makapagpahinga ng dalawang buwan at tutuloy na ang training basta't kailangang mag-exercise palagi. Makikilala niya si Wonyoung Ocampo, ang muse ng school nil

When even breathing feels hard And tears rise up sometimes You can hide in me and cry You can do that Because it’ll pass

Shim Jayoon will never know Yoon Seeun's real thoughts.

Yoon Seeun was the only child in her family. The moment her parents passed away in a car accident, she had no one else to turn to. That's when Shim Jayoon's grandfather - who was indebted to Seeun's late grandfather, decided to take her in.