My Grandpa Is 10 Years Old, the Unbeatable Chess King

Ethan, a world Go champion, encounters two deities playing chess on a hill. After taking over for one round, 49 years pass on Earth. He is given a Divine Peach that transforms him into a 10-year-old boy. Ethan returns home, only to be blocked, bullied by his grandson, and insulted by his son-in-law. He then solves a complex Go game to prove his identity and uses the peach pit to awaken his wife. However, there is another secret behind this family crisis.