Single mother Tan Jing lives frugally to save for her son Sun Ping’s life-saving heart surgery, raising him with care and positivity. Nie Yusheng, a dedicated heart surgeon running a charity project for children with heart disease, selects Sun Ping as his first patient—only to discover that Tan Jing is the woman he loved seven years ago, reigniting past feelings amidst the urgency of saving her son.

After losing his parents under suspicious circumstances, Li Junjie grows up in an orphanage before joining a security agency with his best friend Shi Yunhao. As he undertakes a series of missions, he begins to suspect the organization’s hidden ties to dangerous forces. With the help of Zhou Zixuan, he uncovers clues that connect to his parents’ past and a larger conspiracy.

A wealthy heir and a modest classmate fall in love and marry despite family opposition and outside jealousy. Their relationship is tested by illness, loss, and misunderstandings, but they fight to stay together through it all.

A story between school kids and the teacher in a high school happened in 1985 China.