I have no idea how long I've been playing

It feels like it's been a really long time... I was playing because of the time quests, and now I'm on hidden quests... But seriously, those 'tools' or 'parts' (공구) are always running out.. And sometimes I run out of coins too.. At some point, you'll have plenty of coins but won't be able to upgrade because you lack the parts. If you pick up only the ones that drop those parts then, you can extend your game time. It's much better if you do events moderately in between too. Doing the daily rewards is good. I think collecting cards will be tough. Since the period is long, if you complete them, you should save some moderately so you won't struggle with the next week's quests.. I find that the hardest part, hmm hmm.. Duplicates happen, and since it's just card collection, it's just better to save card packs. Have fun playing!., That mailbox thing is also worth doing. Let's go!