I personally would not book this connection. SEA is a very inefficient airport that is constrained on space, thus creating long wait times for a gate and frequently lots of walking. I just booked a trip for this winter connecting in SEA onwards to ICN where I was faced with a 55 minute or 6 hr 20 min connection. I chose the 6 hr 20 option because my DL flight to ICN is the last of the day, I’ll be coming from a station where deicing is likely, and SEA is such a gamble as to how long it will take to connect in.

That said, I see OP is on the KE flight to ICN. It usually departs an hour before the DL flight so does leave room for the DL flight as a backup option.

Still, the possibility of a misconnect is very high and not worth it in my opinion.