yí​tuán

mystery

疑团 (疑團) yí​tuán
mystery noun
a complex puzzle, enigma, or mysterious situation that is difficult to explain or solve
suspicion noun
a state of deep doubt or a collection of suspicions, often weighing on one's mind

Frequency

Movie subtitles
0.180 per million appears in 0% of films
Written text
0.583 per million

Sources

Definitions
CC-CEDICT