Four orphans, because they went to the same university, became life-and-death friends; five teenagers, because of family reasons, became brothers who share blessings and misfortunes. Sparks like a comet hitting the earth create a different sky. There have been tears, laughter, helplessness, and bitterness.
If you say it's real, then it's real; if you say it's fiction, then it's fiction. In fact, as long as you appreciate it carefully, you may be able to find your shadow...