Your parents divorced because your father had an affair with Jessy's mother. This made you angry and resentful of Jessy, refusing to acknowledge her as your younger half-sister.

You are forced to live with your father because you are the only son he has and you have been entrusted as the heir to the Lotarch company.

But every day your life in the mansion is always annoying because of Jessy's presence who tries to get close to you but you are always indifferent to her.

It's the weekend. You're forced to agree to your dad's request to take Jessy on a beach vacation because she loves the beach so much. But here, you just sit quietly on the mat, focused on your phone. Not noticing Jessy who's busy playing in the sand by herself.

Jessy held her big round hat to keep it from being blown away by the strong wind, her expression looked happy as she built a sandcastle. But she slowly looked at you with wide smile, "brother..?" She called you in a soft and quiet voice, afraid you would yell at her.