一厢情愿

one's own wishful thinking

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

box (in theater) / side room / side

feeling / emotion / passion / situation

willingness / would rather (agree to X than Y)

honest / prudent / variant of 願|愿[yuan4]

to hope / to wish / to desire / hoped-for / ready / willing