Ni Wu took his daughter with heart disease to seek medical treatment year after year, and unexpectedly reunited with his first love Pei Huaiyu whom he had not seen for seven years. At that time, he said "just for fun", which made her heartbroken and walked away. Now that they have reunited, Pei Huaiyu has doubts about her identity, and Sui Sui looks very similar to him. Misunderstandings that have been buried for many years and the mystery of his daughter's life experience have surfaced one after another. Their peaceful lives have become turbulent again, and their emotions and entanglements are once again intertwined.
