180506 NCT 127 'Chain' Teaser 1 https://youtu.be/9nusOmWIUy8
180507 NCT 127 'Chain' Teaser 2 https://youtu.be/Ghg4s6HSn-s
180508 NCT 127 'Chain' MV
180508 NCT_OFFICIAL_JP twt
https://twitter.com/NCT_OFFICIAL_JP/status/993815673120768000
180508 NCTsmtown_127 twt
https://twitter.com/NCTsmtown_127/status/993815407185223685
CHAIN DVD
180525 NCT 127 'Chain' Dance Practice