Dramas or movies with unwanted or fake marriage but later the couple fall in love.

Tae-bum and Soo-young from "Ojakgyo Brothers" have storyline like that :) (I do recommend them to everyone, they are that awesome :D). Oh and currently there's another couple, Hyung-tae/Mong-hyun from "I Summon You, Gold" that got married after an arrangement between their families. It's still a bit early in the game, but it's pretty safe to say they'll end up falling for each other.

tvxqjung wrote: I've only watched one drama with a similar theme: Incarnation of Money. Although that theme you're looking for is not what the whole drama is all about, the chemistry of the two F/M main role makes up for it.

Uh, no... There's no unwanted or fake marriage in that drama...

Wonderful Life :)

When love walked in .. <3

You must try Fated to Love You (as already mentioned) and Sunny Happiness. Both are Taiwanese dramas. Mary Stayed Out All Night is the only Korean one I've seen that you didn't already mention. It starts out cute but the end is kind of a mess. It's still a cute drama though. I liked it!