It's really shocking to know another idol has passed away so soon. But reality is so harsh, man... cardiac arrest can happen to anyone, regardless of age. It was so sad that he couldn't be saved in time... So many what if's just came out in my head. What if he got found earlier? Would he be alive right now?? But the chances in surviving are quite slim... T.T 

I can't believe it.

Rest well, Minwoo.