Lianai Huangyan

Xue Yang auctions his sketchbook off online to purchase his younger sister’s favorite idol, Ji Jiayu’s concert tickets. The buyer later discovers a love letter that Xue Yang had forgotten in his sketchbook. Little did he know, the buyer is Ji Jiayu, and the two of them get closer and closer in the anonymity of the internet...

(Source: Bilibili Comics)