There's an event 'guess Wheein's solo track title' on fancafe
Post your guess on '휘인 Solo 타이틀곡' section on fancafe with this format : Name / Nickname / your guess / reason
Then post it as a secret comment
17 random people who guess it right will get a signed jacket photo
https://twitter.com/vinne0312/status/982084374144471042