Compare words like "thin/fin," "mouth/mouse," and "both/boat" Transcripts at pronuncian.com

At the end of the word, the /ŋ/ doesn't need an additional /g/. The /g/ is potentially included mid-word. Transcripts available at pronuncian.com

"Coarticulating" the /g/ and /n/ is the trick to fluent pronunciation of these two sounds. Don't release the /g/ before starting the /n/. Transcripts available on Pronuncian.com