Promise?

-Sunghoon and Riki from ENHYPEN au-
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Sean and Rael, a very sweet and caring sibling.

Rael is an ordinary high schooler and has a goal of achieving his dream as an idol. Sean promised to Rael that he'll be always there's supporting his brother and will take care of him always.

Fortunately, after many years of training... Rael finally got to debut in a group called "Enley".

Him and his group members were really happy, but because of Rael's one simple mistake in stage, things suddenly turn upsidedown.
Lots of people starts to throw hate to Rael, and demanding that his brother (Sean) should replace him instead.

Rael's manager decided to talk to Sean, he made an offer to Sean that if he accepts to join and replace his brother in the group... He'll have a great and stable career no matter what.

Will Sean choose to fulfill his responsibility of being a great brother to Rael or, choose to join and replace his brother... And be a successful idol.... Like he always wanted, aswell.