Korean has a three-way laryngeal contrast in oral stops. This paper reports perception patterns of plosives of Japanese, French, English and Chinese by Korean speakers. In Korean loanwords, laryngeal contrasts of Japanese, French, and English plosives show distinct patterns. To test whether perception explains the loanword patterns, we selected languages with different acoustic properties and carried out perception tests. Our results reveal discrepancies between the phonological adaptation and the acoustic perception patterns.