Marriage and how people seem to be marrying not their chosen love but having to settle for someone they don't love but have to marry because of circumstances.
Here are the examples:
Shiv & Gauri
Anupum & IpSHITa (altho Anupum did love Ipshit but it wasn't returned)
Vivaan & Asska or Asstha (whatever her name is)
and now it'll be Ram & Palak