怨 is a Chinese hanzi, listed here under the keyword “hatred”. It is built from 夗 (to turn over when asleep) and 心 (heart). It appears as a component in 1 other character in this index.
On KumiJi Glyph Explorer, open the parts search and type “to turn over when asleep” + “heart”. 怨 is among the results, together with every other character containing the same shapes.
Open 怨 in the interactive kanji search
to expand every part down to its smallest pieces, add your own names and mnemonic stories,
or search for other characters by their parts.