I’m not entirely sure I understand the part of the plan where they go back and save Jin Yuri. Do they plan on going back to rescue her after jumping out of the hole? Are they going to circle around the hole to find the other entrance and rescue her? I don’t understand how that’s faster than running to the opposite cell to group up with her first. Did Yu-Seong get her out of her shackles while Jin Do-Yun was breaking down that wall? I don’t understand how taking the longer route would let them get to Jin Yuri before her cell gets filled up with poisonous gas.