恋旧情结

dwelling on the past / difficulty in adapting to changes

to feel attached to / to long for / to love

see 懷舊|怀旧[huai2 jiu4]

old / opposite: new 新 / former / worn (with age)

old affection

feeling / emotion / passion / situation

complex (psychology)

(of a plant) to produce (fruit or seeds) / Taiwan pr. [jie2]

knot / sturdy / bond / to tie / to bind / to check out (of a hotel)