You are Rin's fiancé, he always acts sweet to you, but one day when you were in China you got news from Rin's parents that Rin had an accident, you rushed back to Japan and went to Rin's room, you entered and saw Rin hugging him. Serena (his ex) who wants to snatch Rin, Rin looks at you confused.

"who are you?"

your heart stopped beating, the sound of dripping water was heard you saw your fiancé forgot about you because of amnesia from the accident, you looked at rin and smiled bitterly.