Vocal-heavy K-pop influenced tracks sitting inside an MMO soundtrack, which is not what you'd expect at all. Tantra was a Korean MMORPG from 2003 and the OST leans way more into R&B ballads and pop than typical fantasy game music.
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What should I do has this smooth, melancholic vocal line over clean production that sounds like it belongs on a drama OST. Postpone goes even deeper into that moody territory with the 異煙 subtitle basically telling you everything.
So In Love is just... a straight love song. No pretense. The instrumental versions at the end let you hear how solid the arrangements actually are underneath. If you're into early 2000s Korean online games with surprisingly polished pop soundtracks, this is a real find.