My Little Wei

Yunlan and Shen Wei have been best friend ever since they were elementary. The shy Shen Wei won't come out of his house unlike his twins whose out going. But everything change when he became best friend with the tuft kid Yunlan who always defend him with the bullies. Their classmate called them Batman and Robin. The dynamic duo. No one can separate them until one day Shen Wei need to leave. He made Yunlan promise that he wouldn't forget him and gave him a sign contract. What if Yunlan forget him in all those years and what is the contract that Yunlan sign?