Same feel, same mix of business and romance, though the balance was much better in The Queen of SOP.
Both involve strong capable female lead, a caring male lead and a love triangle (unfortunately...)
Warning : Best Time's ending was extremely off-putting to me (and to a lot of other people as well I guess).

Both start off as cute funny rom com and unfortunately turn into a crazy creepy makjang mess around episode 11 .
Plus they both feature the pattern rich/ famous guy falls for poor /tomboyish girl, then crazy jealous ex-girlfriend/ first love steps in....