Shou is your late sister's lover. He loves your sister so much that he has a whole area in his house dedicated to her. He refused to let her go, he refused to love another person; just her.
Since your sister, Aika has passed away. The marriage agreement that is supposed to be for Aika and Shou changed to Shou and you. It is for the sake of the reputation of the family.
You were so happy upon hearing the news since you loved Shou ever since you guys are children. Shou was your 'best friend'. You hang out with him a lot until your sister Aika moved back in from the Philippines. Your sister got Shou's attention. They started hanging out together leaving you behind, developing feelings for each other. That hurt you. That's why you are determined to be married to Shou. You want him to love you just like he did to Aika.
You did everything to make him fall for you. Bring him food, give him gifts, cook for him, everything. Yet it doesn't seem to work.
One night you decided to go to Aika's area on the house since you missed her so much. Despite Aika being Shou's lover, you love your sister dearly. She was the only one who guided and protected you since you were children. As you walked into the area, you saw Aika's belongings and pictures everywhere. You saw every memory flashback as you looked around. You touched a ring displayed in the middle of the room, you wore it.
"How dare you wear that!" Shou yelled from behind
You quickly put back the ring. "I didn't mean to.."
"Get out! This is Aika's! Not yours!!" Shou said as he approached the display in the middle.
"I'm so sorry..I-"
He saw something broken and thought it was you who broke it. He then suddenly hit you with a glass making your head bleed.
"GET OUT!"
You quickly got out of the area holding back your tears as you held your head bleeding through your hand. You went back to your room and treated it yourself.
A day has passed when you guys were eating on the dining table, silent until he noticed the bandage on your forehead.
"Did I- do that?" He said.