You may like
Lady & Liar. Here's what it's about, without spoiling it anymore than the synopsis does on mdl: the male lead, Bai Lang, a wealthy squad leader, falls in love with the female lead, Jiang Xin, and within the first two episodes I believe. However, she's already in a relationship with somebody else. Jian Xin is poor, but she discovers she is an heiress, and right after she gets into an accident and loses her memory. Bai Lang, desperately in love and aware he had no chance with the old Jiang Xin, takes advantage of the situation and lies to her, telling her she is his fiancé. Little by little though, she gets closer to the truth. It has the three bonuses you listed, only they live together engaged, not yet married! I think it's more or less entirely subbed on
viki :) (I haven't finished it yet, cuz when I picked it up the subbing stopped for a while, but from what I see they've almost finished it now)
I also second
Sealed With a Kiss. It's not exactly the same plot you're looking for, but the male lead forces the female lead to stay with him like no other drama character I've seen so far. I found it a bit too cruel though, so I gave up on it.