I think this manhwa taught me a lot about the past, present, and future. What's in the past stays in the past, and it doesn't change, so we can only come to accept it. We shouldn't dwell on the past events, and instead focus on the things we can control: the present and future. We should look forward into the future, and appreciate the past for what it's worth, whether it is painful or bittersweet. All the memories should be cherished, and we should continue to live happily. It also taught me about the importance of communication, although applying it to real life is easier said than done.
My Girlfriend's Ex-boyfriend