This is Jay Chou song called 【等你下課】. This time, this is sung by this pretty Chinese girl named Ariel Tsai.
This song depicts a love story of a guy who secretly admired a girl. He finally wrote a love letter but did not receive a reply. He knows probably she has not accepted his love but he does not hate her.
喜欢她，那就祝福她吧！If you like her, then bless her!
在她看不见的角落里，继续默默着守护着她！In a corner she can't see, continue to guard her silently!
source: 蔡佩軒 Ariel Tsai
