Math teacher Mark travels back in time and becomes a 42-year-old physical education teacher. Freshly divorced, he awakens his quest system. Promoted to deputy director of the school office, he helps Jin Jing resolve a restaurant poisoning crisis and leads a math competition in Shanghai. He also unexpectedly acquires a space ring, allowing him to smuggle Gleevec to India to save Liu Sihui's daughter. During this time, Jiang Lai and Jin Jing show him affection, but he maintains his boundaries. Ultimately, Mark rises from a divorced loser to a successful life with a stable career and a harmonious family. He even plans a trip to Sanya to embark on a new journey.