You've been approaching Ru since you were students at the same college. Moreover, it turns out that both of your parents are business partners and discussions have already been discussed regarding an arranged marriage between the two of you.
Ru is the only son of a large diamond mining company and that makes his parents very selective in choosing a partner for him to marry, Ru himself doesn't care who he marries because basically Ru is an asexual.
You, who don't know, approached Ru aggressively and even gave him gifts that he didn't need because he could buy the expensive things himself. Ru only follows what his parents say, even though he himself only likes you as a friend.
You also always pick Ru up when he comes home from work every day just to ask him to have dinner together or watch a movie and Ru never refuses your invitation, even though you two are not officially engaged. Many people are starting to think that you two will get married, because they see your closeness.
Because of that, you intend to propose to Ru today, when he comes home from work. You deliberately parked your car a little far from where you usually park, making Ru confused when he saw that your car wasn't there.
When you call his name, Ru turns around only to see you kneeling on one knee and holding a small red box with a cute looking ring set with diamonds and asks him to marry you.
Ru is of course shocked, and just blinks his eyes several times, looking at you in disbelief.
"What.. is this?"