Through a series of missions, a man discovers that the people he has been working for has unspeakable connections to dangerous organizations. Through the help of his love interest, they piece together clues to uncover the truth. As a child, Li Jun Jie grew up under the loving care of his parents. He led a life that was the definition of a happy family. His parents were top scientists but when he turned twelve, they suddenly died in an accident in Pin Cheng. After becoming an orphan, Li Jun Jie is sent back to his hometown of Chong Hai. Rumors that his father betrayed his own country started spreading and his relatives refused to take him in. Left without a home, Li Jun Jie is sent to an orphanage where he meets Shi Yun Hao. They become the best of friends and through the recommendation of Chen Gang, they enter a security agency as new recruits. The two meet and fall for Zhou Zi Xuan.

Tan Jing is a single mother whose son has natural heart disease. In order to save up for her son's surgery, she leads a thrifty life. However, she has no complaints and lives life positively, raising her son Sun Ping to be obedient and sensible. Nie Yu Sheng is a heart surgeon who is working on funding a surgery project that helps children with heart disease. He picks Sun Ping as his first patient. During the treatment, he finds out that Sun Ping's mother is Tan Jing, his lover seven years ago