SPOILER ALERT !!
excellent show! though all of us are upset about hanseo's death, i would like to point out some things regarding the fact that many have been disappointed by vincenzo's actions in episode 19. remember when hanseo as a joke called out chayoung's name and vincenzo immediately looked around not realising that he was fooled? that clearly portrays how chayoung is always his first priority and thus when she got shot saving him, he could think about nothing logically, and just kept on staying by her side to prevent further harm.