If this follows most rom com tropes. The friend probably does like MC's friend and is supporting FMC at first. Bonus, if the MC's friend also has a thing for the MC, or the FMC. However, something will change in the dynamic later, and FMC's friend will see MC in a new light, and she will eventually confess, but realize it is too late, because by the time that happens, he realizes he loves FMC. I am sure he is going to save the fmc from either an arrange marriage, moving to a different country or stop her from going on date with his friend (bonus if he gets there only to find out fmc told her date she is still in love with MC and can't go through with the date). That's my guess. Oh, I am sure we will get other rivals to pop up as well.