DongHo is always being an introvert. This isn't because he doesn't believe anyone, it's just because one condition. HE DOESN'T WANT TO BURDEN EVERYONE WHO IS IMPORTANT FOR HIM. But it changes. It changes when DongHo meets Kevin -his childhood friend, accidentally. Kevin is successful to make DongHo believes and relies on him. From that on, DongHo shares everything, hopes that Kevin also shareshis problems to him. But, one day, something that make DongHo feels betrayed, happened.....