M-21 and M-24 kidnap Yuna and use her to call out rest of the children to kill them. Ik-Han informs Frankenstein about this, thus calling the wrath of both Frankenstein and Raizel down on M-21 and M-24.
M-21 and M-24 kidnap Yuna to call out Shinwoo. M-21 tells them not to inform the police otherwise they will kill her. Shinwoo recklessly charges towards the location while Ik-Han informs Frankenstein about the situation. Both Frankenstein and Raizel arrive at the scene, and Frankenstein releases his aura to provoke M-21 and M-24 for a battle.
M-21 and M-24 are caught from behind. Frankenstein gives them the option to either die or leave silently. Unwilling to choose from the given options, M-21 and M-24 attack their unknown nemeses. M-21 takes on Frankenstein while, M-24 aims a punch at Raizel in order to kill him. M-21 thinks that guy is finished but as the smoke clears out, it appears that he's wrong. Raizel is even more powerful and he has stopped the attack with a gentle move of his hand. Even more startling is when Raizel simply says "KNEEL" and M-24's body obeys the command. M-24 wonders how could a child who was with the rest of children be so powerful.
Raizel takes his leave and asks Frankenstein to do the same. Frankenstein tells both M-21 and M-24 to leave the children alone.
Raizel spares the lives of both M-21 and M-24 on the condition that they leave the children alone. The fact that they let the children escape gives rise to major incidents in the future primarily because the Infected reveals the existence of the children to Jake.