Ms CEO and Her High School Husband HS Hubby

One day Ai comes to meet with her grandfather to discuss business. As she stands up, she feels dizzy. She then collapsed. When she wakes up, she finds herself in an unfamiliar place. As she gets up, she realized theres a man laying next to her. (W-who...?)
She heads back to company she barges into the meeting. She tells everyone to get out for personal business with her grandfather.
"Ai." "Why did you do that to me?" "He'll be your husband." "What?!!" Someone whispers to her ear. "Honey. You left without saying goodbye." She startles and turns around. She notices he's wearing a high school uniform. "Nice to meet you, my dear wife." "I oppose this marriage." She walks out.