Four Seasons and Nine Songs

In 2095, Jiang Chunyang, Xia Guanxing, Kong Qiuyue, and Zhou Dong connected their minds and traveled back 90 years due to a mysterious lunar experiment. Zhou Dong is a soul traveler with many personalities; Xia Guanxing is reborn and travels back in time and wants to change the past; Jiang Chunyang travels back to his own system and was once a pawn in the spy Dragon King's plan to fight against his evil biological father; Kong Qiuyue travels back in time and decides to travel around the world with a new identity. The four people each had their own challenges after traveling through time. After meeting by chance, they tested each other, and the forces of Jiang Chunyang's biological father threatened them. Afterwards, the four people confessed their identities and joined forces to fight, and investigated the secrets of time and space behind the lunar experiment. They finally succeeded in smashing the conspiracy, became close friends, and found a new direction in life.