Thirty-two-year-old Li Wei is a physical education teacher at Chunfeng Primary School. After her divorce, she lives alone with her five-year-old son. Life was peaceful until 25-year-old Lu Chen was introduced to the school as a tennis specialist. This young man, who looked ordinary but exuded vitality, became her apprentice. Li Wei appreciated his talent and devoted herself unreservedly as a master - helping him with his lessons, revising his teaching plans, and accompanying him in competitions. What made them stop talking about everything and never say anything again?