The Substitute Star

Stellvester Ajero one of the member of International, well known Filipino group SB19.

But there is one thing that people don't know about.
She has an identical twin sister, Starvelle Ajero a registered nurse that has based in Japan.

Stell decided to have a vacation there to bond with her twin sister before a month long preperation for SB19'S Anniversary Concert.

On the other hand, Ethan Park,The owner of XnB Entertainment, the former company who handled SB19 is planning to get a chance to destroy the group. Ethan Park will try to get rid of Stell while he is on Japan, But Luckily, Stell is safe but still unconcious.

Due to series of events, Starvelle will be forced to pretend as her twin brother Stell and she will be part of SB19 secretly.

What would be happend?