Seonghwa is considered the ''Mom'' of the group.
Seonghwa is the oldest member of the group.
He is nicknamed ''Mars.''
Seonghwa is the best at cooking and cleaning among the group.
Seonghwa considers Exo's Kai and SHINee's Taemin as his role models.
Seonghwa is often the one who cleans the dorms.
Seonghwa originally auditioned as a rapper but he ended up debuting as a vocalist.
Seonghwa auditioned to join ''YG Entertainment's'' survival program, MIXNINE but didn't pass.
The song "Thank U" was also written by Hongjoong to express his gratitude towards fellow member Seonghwa.