The way he spoke and the creepy smile which he carried on his face, upon experiencing such dreadful encounter, Kim Il-sung's already pale face paled even further as he felt extremely horrified by Park Seung-gyu's ruthlessness.
Although he hadn't played with him for a long time, but still he had spend quite some time with this person. And even though he found Park Seung-gyu's personality somewhat unlikable given his arrogant and crafty nature. However it was his first time witnessing this nasty side of Park Seung-gyu.
How could he enjoy someone else's misery so casually? How can he be so heartless? What if he suffers a career ending injury?
If it wasn't anything serious, probably he too wouldn't have paid any heed to Hiro's condition. However judging by the reaction which Hiro was displaying at that moment, he simply couldn't help but think about the worst possible situation.