While calling the flop with a small underpair is a standard defense, you should check back the turn to realize your equity rather than turning your hand into a low-frequency bluff.
Flop Analysis
Calling the small c-bet is mandatory. We have a backdoor flush draw and enough raw equity against SB's wide range to continue, especially getting over 4:1 odds.
**Ranges:** SB has a range advantage with top pairs like QJ/QT and overpairs, but we have plenty of 5x and Tx that must defend. Our 22 functions as a bottom-of-range bluff catcher that unblocks SB's air like AK/AJ.
**Math:** We need only 19% equity to call. With 36% equity against SB's betting range, folding would be a massive mistake that allows SB to print money with any two cards.
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> **Takeaway:** Don't over-fold small pocket pairs to tiny c-bets on high-card boards; you have enough equity to see a turn.
Turn Analysis
Checking back is the preferred play. Our hand has significant showdown value against SB's missed draws, and betting doesn't accomplish much since we fold out hands we beat and get called by everything better.
**Ranges:** SB's check often represents a condensed range of marginal made hands (Tx, 5x) or air (As6h, Kh8h). By betting, we isolate ourselves against their calling range which is almost entirely Qx or better pairs.
**Plan:** By checking, we keep the pot small and reach showdown cheaply. If we bet and get check-raised, we are forced to fold a hand that still has ~45% equity against SB's overall range.
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> **Takeaway:** When you have a marginal hand with showdown value, check back to realize your equity instead of turning it into a bluff.
Note: Betting 22 here is unnecessary; the hand has enough showdown value to check back and realize equity against SB's air.