sampan
舨 refers specifically to a sampan, a small flat-bottomed wooden boat. The meaning is narrow and concrete, with no broader conceptual cluster.
舨 combines 舟 (boat) with 反, which likely contributes a phonetic element. The character was created to represent a specific type of small boat, the sampan.
A boat (舟) that is the opposite (反) of a large ship: a small, humble sampan.
For ハン, picture a hand (ハン sounds like 'hand') pushing a sampan away from the shore: hand -> ハン.
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