Originally Posted by
businesscasual
The UA website is suggesting that I could book an itinerary with a 55 min connection time in SFO (DEN-SFO-ICN), but also says "Risky Connection". Yeah, I'd call something below the MCT a risky connection.

Something below MCT isn't a risky connection -- it's disallowed.
UA-UA MCT at SFO for a D-I connection is 45 minutes.