The Lion in March is adapted from Qianhua's best-selling cartoon of the same name. The film is divided into the first part and the second part, the latter part is mainly about the protagonist's vision of the "future": he will start a new life with the people he loves. A year after meeting the neighbor's three sisters, Tongshan Zero's life has begun to change, and he has gradually realized his true self that has been sealed in his heart since he was a child. In addition to chess, Tongshan Zero began to come into contact with a new and warm world. In the chess game, he fights with professional players who have amazing talents and are keen to play chess. In life, he gets the warmth of home given by his neighbors and sisters, which shines on him like the sun. Tongshan's ice-like heart gradually melts. The chess game and the warm family made him learn to love while living a full life.