Yan Bingyun and Shen Wan 'er were characters from the novel " Celebrating Years." Yan Bingyun was a spy sent by the Qing Kingdom to Northern Qi, and Shen Wan 'er was the eldest daughter of Northern Qi. Shen Wan 'er did not know Yan Bingyun's true identity at first, but she gradually fell in love with him. However, Yan Bingyun did not have any sincere feelings for Shen Wan 'er. He was only using her to obtain information about Northern Qi. Even so, Shen Wan 'er's feelings for Yan Bingyun were very deep. There was no clear description of their ending in the literature.
Maybe you haven't found the right type of literature yet. There are so many different genres out there, like science fiction, mystery, or even graphic novels. Try exploring different styles and you might change your mind.
Look for books that are related to your hobbies or interests. For example, if you like sports, there are many sports - themed novels. This might make reading more enjoyable for you.
Toge Inumaki is important too. His special cursed speech ability makes him stand out. Also, the principal of the school, Masamichi Yaga, is likely to be important as he is in a position of authority and has an influence on Gojo and the other students. There could be other characters like the members of different clans that also play roles in the complex web of the story.
Perhaps the development of the characters felt forced or the overall storyline was too predictable. Maybe there was a lack of depth or complexity that you look for in a manhwa.