"If this is DOMESTIC lounge ..."
Yes, you are right, it is the INTERNATIONAL lounge where I were last year, going back to SIN.
Next month I will have two flights on VN, coming first from NRT with transfer in HAN to DAD in C ( so probably domestic lounge you mention ) and the other, from DAD to VTE via HAN. I don't know if I could wait in the international lounge for this flight to Laos, as it is a VN codeshare on Lao airlines (not Skyteam), with only one segment in C DAD-HAN but in Y for HAN-VTE ...(with the big problem of limited weight to 20kg)
some photos on domestic lounge in HAN
https://fr.foursquare.com/v/domestic...d6f04d9e666250