I'm conducting an experiment in the form of this survey. Please take it and help me- it's a scientific experiment that's easy and painless!

choose which twice member owned each era and compare your choices with others! (will only include korean releases of albums from Like Ooh Ah to Scientist)

You are a newly hired scientist testing an anomaly we've just found, the first one, in fact. Gather information based on information. Good luck. (SCP inspired)