Mingxuan thought that Tang Tingyi didn't love her at all. He was prejudiced against her from the beginning, but he only had responsibility and pity in the future.
Tang Tingyi thought that once he got married, he would be responsible for the other person. As for what love was, he didn't understand it and he wouldn't have it.
Later they discovered that they had actually been going in both directions during those times, but they had never communicated with each other.
But fortunately, after all the changes and doubts, that person is still around.