Whether in the US or Korea, this one extra pitch is the problem

‌
Looking at the pitch count, it would have been right to pull Snell after a solid 6 innings.
But because a left-handed batter came up, they left him in hoping he might shut them down since he's a lefty.
As a result, they gave up back-to-back two-run and solo home runs, and the game was effectively over.
Especially in postseason baseball, players pitch with maximum effort, so you have to reduce the effective pitch count by at least 10%.
They shouldn't have left Snell in for the 7th inning.
The outcome was the kind of result commonly seen in the KBO, where he fails to get outs and only increases the runs allowed.