The story of a huge incident faced by Seo Soo-yeon from the support management team that supports and manages NIS field agents in China, Jang Cheon-woo, a hidden NIS black agent and Do Jin-sook, deputy director of overseas parts.

A K-pop star, Sa-gye, reluctantly enters college, forms a 4-member mixed band, and navigates love and growth through music amid the chaos of campus life.

After a powerful conglomerate chairman is betrayed by his children and wakes up in the body of a young soccer player, he uses his business genius and athletic physique to seek ultimate revenge against his family.