Ok I got past 76 but 77 is even harder lol. Double Yuhee and a Beernox + Byun combo for big heals. For 76 I defended the first 2 rounds, then started focusing attacks on Akaoni. Meng and Kantos will do their EX. On the 3rd round you should be able to kill Akaoni. Try to save Jeffrey's EX if possible. Use Owlbert's EX to try and put Choi to sleep. If he doesn't get put to sleep you might have to defend and heal. The healers order kill is Byun -> Meng -> Kantos. The key is to use Jeffrey's EX on Byun on the turn before Meng and Kantos can use their EX. That will make it so Meng and Kantos won't heal as much with their EX and then Byun's regular heal is weakened. Make sure you have everyone else use their basics on this round. If you have the health then use Owlbert's basic, otherwise use his EX to keep Choi asleep. On the round when Meng and Kantos use their EX, you should be able to kill Byun. Then use the same strategy on Meng. Keep Choi asleep and then finish off Kantos, then kill Choi