Baoyu wakes from a nap to find a glowing panel before him that he can't get rid of. The Matchmaker System tells him: pair up Prince Beijing Shui Rong and your younger brother Jia Huan, and Lin Daiyu will live.
Baoyu: ???
He's met Prince Beijng only once, and though he and Jia Huan are brothers, they've never had a heart-to-heart. Make two people with nothing in common fall in love? Baoyu thinks he must be going crazy.
Two couples
Baoyu will always choose Daiyu
Shui Rong * Jia Huan
P.S. One of Baoyu's matchmaker manuals is My Lord's Attendant Is No Easy Job, from Dream of the Red Chamber: Huanpei. Look it up yourself. Whether you read it won't affect your enjoyment of this story.