Tier 2 salaries in Japan range from 200,000 to 800,000 JPY per month. (about 1260 to 5100 USD). 800,000 JPY is a very large amount of money for a tier 2 player, slightly higher than the minimum salary in tier 1. However, most players will be stuck at the bottom, and only a few imports and star players will be able to earn high salaries.
In Korea, it's hard to say what the average amount is because there is so much disparity between the orgs. More than half of the teams are unorganized teams. They don't get paid, and even if they have sponsors, they're lucky to get some pocket money.
On the other hand, organized teams like fearx, dk, ns, and academy teams should be able to pay a stable salary. The amount is unknown, but for reference, the LCK Challengers, which all of those teams participate in, has a minimum of 20,000,000 krw (about 13650 usd) per year. Keep in mind that some players are paid more than the minimum, and for richer organizations like t1 academy, they'll be paid more, and it could be on par with the tier 1 minimum. If so, they would be the most expensive tier 2 players.