19 Years ago, Su Chen came home drunk at night after being broken up. He unexpectedly had a one-night stand with policewoman Su Wanqing and then lost contact. Today, he has become an ordinary university lecturer, but his four 18-year-old school belle daughters block him at the door of the classroom and call him "Daddy." What shocked him even more was that these four daughters were actually born to Su Wanqing back then. Su Wanqing was now the senior superintendent of the police station and moved in with him with his daughters due to special tasks. Facing four daughters with very different personalities - the youngest daughter who looks cute but is actually wild, the third daughter who is middle school but longs for her father's love, the second daughter who is gentle and sexy but hides dark attributes, and the eldest daughter who seems normal but is the most "sick", Su Chen falls into an unprecedented parenting dilemma. Fortunately, he accidentally activated the "Daddy Selection System", which can provide solutions to various difficult and complicated diseases of his daughters. However, as he got along with his daughters, Su Chen gradually discovered that there was a secret about himself hidden behind their daughters' anomalies, and Su Wanqing's sudden return was no accident. A conspiracy from 19 years ago was gradually surfacing, threatening the family he and his daughters had just established.
