Need to level up characters for hidden quest conditions

To level up characters, you need character cards and gold. You get plenty of character cards, but gold drains pretty fast. Instead of leveling up all possible cards, it seems better to save gold, try out characters, and slowly upgrade them to fit your deck. When building a deck, it's good to include characters that provide buffs and balance tanks, damage dealers, and healers. Even if your deck isn't great, if you synthesize well, comebacks are quite easy, which is addictiveㅋㅋㅋㅋㅋ In the early game, prioritize synthesizing to break rocks. In the mid-game, focus on synthesizing characters around level 20 for super merges. In the late game, paying attention to positioning, like having tanks in front and healers in the back, will lead to easy wins!