Love letter manga

Love Letter summary:

A girl named Yari met Kemin on her trip to Taiwan. They really liked each other and had tried every efforts to keep their relationship. However, language difference and time difference had shattered their hope. Two years later, she was on her trip to Taiwan again with love and hope, she found out that he was engaged, but broke up because Kemin loves Yari. Yari and Kemin had a long distance relationship. Soon, Yari had doubts about Kemin and starts to worry that Kemin might be cheating on her. But despite all the doubts, they managed to be together.