If you are looking for other Asian media featuring "Wan" characters in romantic diary-style formats, these titles also fit the description:
A recent trend in Korean indie games: You are the diary entry. The love interest is the reader. You are a ghost, amnesiac, or AI, and he writes about you. The romance is experienced entirely through his perspective notes. The player feels more like a treasured memory than a protagonist. asiansexdiary asian sex diary wan this is f full