If you celebrated National Day in 2000, you might be able to solve a mystery about HDB estates.

A Reddit user shared screenshots from an old music video and asked for help to find the HDB estate.

The singer is seen dancing in front of some HDB flats built in the late 90s.

The user wanted to know where the flats are and if they still exist, but there were no clues.

Reddit users started to help.

Some users thought the flats were in Pasir Ris, but the user couldn't find a match.

Many users thought the answer was Serangoon North.

Some users believed they found the exact location.

One user said the flats are at Serangoon North Avenue 3, but they are hard to reach by public transport.

Another user thought the filming spot was near Block 550 at Serangoon North Avenue 3.

The user did some research and thought the music video was filmed from a multi-storey carpark.

The user listed the blocks that can be seen from the filming spot, from left to right.

The mystery was also bothering other people.

One commenter loved the old flats and thought they were the best era.

Another user suggested making a YouTube video about the discovery.

Would you have guessed that the HDB blocks are in Serangoon North?