The ADR? I myself am new to the entire c-ent but it's pretty (auditorily) evident that they use ADR/dubbing extensively lol (one tell is how "clean" the track is). That's already interesting enough to me because a lot of other televisual industries nowadays tend to want to flex their budget in how much they low-key spend on having quiet sets (or how expensive their cast are that they're not budgeted to spend more hours at the studio) but I understand the historical ones persist for similar reasons as with Indian ones: consistency and the money vs time saved. Honestly I wouldn't have rabbitholed into this if not for the fact that I could spot the voices for wwx and lwj in cql are the exact same as the ones in the audio drama I've managed to listen to, lmao. This was funny to me because it was the exact opposite logic to Indian shows (where actor keeps their voice but someone else sings their songs lollll)
Anyway, zhz making a big deal about this technical point was definitely one reason why it shot up my to-watch list š. But it's definitely an expensive production. You can see the money showing up everywhere, very prestige budget.