Hundreds of lives of reincarnation and hundreds of lives of suffering, once you become a Buddha, don't look back.
Foyin thought that he could overcome the complex, let go of the future, and reach the state of forgetting emotion, with no desires, no thoughts, and no pain.
Qing Lan thought that everything was just a misunderstanding, and if she could explain it clearly and be forgiven, everything could be treated as if it never happened and she could start over.