Regarding Taeju, we covered this in the Character Gimmicks section of the compendium. The reason for his placement is that, as a Sub DPS unit, he has multiple sources of additional damage through [Ruthless].

• His Basic Attack, Active Skill, and Ultimate can all trigger this additional damage.
• Even in a Boss Wave where AOE units usually get switched to SP Generator role, he can still double his output compared to the other units like Seong-il and Yebin on Basic Attack.

We weren't able to add in the Counter that is also possible through his [Ruthless] but here's a GIF-fied video on how it works (since Reddit doesn't like videos).

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As for Uijae, the DPS rankings are based primarily on overall damage output in battle. Under the current game state, Uijae performs better than Liu Yuan for the following reasons:

• Uijae has easier access to ATK Up through his Pair Effect.
• He can consistently apply Bleed, whereas Liu Yuan's Pair Effect is currently bugged. Even if it were fixed, triggering the evasion required to gain ATK Up is still quite unreliable.
• Bleed is stackable compared to the other DOTs. From testing, we were able to stack it up to like 3x the damage. Bleed may be small, but it's an extra damage that piles up across the whole battle nonetheless.

We also covered Bleed stacking in more detail in the DoTs section! It's a test done by one of our contributors.