Han Zhen should actually be grateful to Liu Zhao. If Liu Zhao hadn't cheated on him, he wouldn't have met Li Chen, and he wouldn't have known that there was someone else who could only be with him!
Li Chen should also thank Liu Zhao. If Liu Zhao hadn't cheated on him, he wouldn't have known that he was not a useless person, but a person who had to tie the bell before untying it...
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