Overview
After a suspicious fall leaves her in a coma, Aiko wakes to a nightmare: her boyfriend is now married to her sister, and her promising career is gone. Trapped in a web of betrayal and secrets, she sets out to uncover the truth in this twisted tale of love, loss, and revenge.
Seasons & Episodes
Season 1
Key Information
Cast & Crew
Shiori Akita
Aiko Miyata
Takuya Kageyama
Yuma Yoshimura
Riho Takada
Saeko Miyata
Masashi Ikeda
Takatoshi Makino
Hinako Kitano
Mai Yamaoka
Mariko Akama
Yuriko Yoshimura
Tomomi Maruyama
Masaki Yoshimura
Frequently Asked Questions
After a suspicious fall leaves her in a coma, Aiko wakes to a nightmare: her boyfriend is now married to her sister, and her promising career is gone. Trapped in...
The Reason My Boyfriend Married My Older Sister has 1 season with 8 episodes.
The Reason My Boyfriend Married My Older Sister premiered on August 7, 2025.
No, The Reason My Boyfriend Married My Older Sister has ended. The final episode aired on September 25, 2025.
The Reason My Boyfriend Married My Older Sister originally aired on MBS. Check your local streaming services for availability.
The Reason My Boyfriend Married My Older Sister has a rating of 7.0/10 based on user reviews.
The Reason My Boyfriend Married My Older Sister is classified as Drama.