Right
曼 supplies the sound màn exactly.
曼 itself means 'long, drawn-out, graceful,' so it doubles as a strong semantic clue: a slow, drawn-out attitude. Phonetic family:
漫 (overflow),
蔓 (vine),
馒 (steamed bun) — all on the
曼 sound, all with a 'spreading, long' nuance.