Ryuchen want his wife to experience the sadness and loneliness that he felt when she left him when they're young, and he succeeded.
His wife, Chloe, became miserable and now experienced the sadness and loneliness that he felt back then.
Until he found out the truth and realizes that everything in his life is a big lie. That he believed in the wrong person and ruined his wife's life, and it was too late for him to make things right.
Because his wife had been dead.
After he discovered the truth, an accident occurred causing him to lose his life.
But for some inexplicable reason, he was returned to the past and was grateful that he had given a chance to make things right to his wife.
But things become different from his previous life, because his wife suddenly wanted to get a divorce.