未練
みれん · miren · JLPT N1 · noun
affection
未 (not yet) + 練 (polished, refined): a bond not yet finished, so it lingers on
Miren is the attachment that won't let go, love or regret for something left unfinished. 練 also means practised, so a story that was never completed still holds on to you.
未 — tree 木 with extra short top stroke
未 originally pictured a tree with luxuriant new branches at the top, suggesting tender shoots not yet matured. From this 'not yet ripe' image it came to mean 'not yet' or 'have not.' It is also the 8th Earthly Branch, used in the traditional sexagenary cycle.