I have some βHidden Loveβ connections concerns that I am posting as a spoiler in the comments below.
According to the novels, just to give you an idea. The scene where they all attended their friend wedding, SY and WYF have already started dating. In the novel she arrives late to the wedding, after SZ and DJS have left. When SY went to Yihe to check up on SZ and found out she's dating DJS, SY and WYF have already became a couple. WYF cokes to Yihe during that trip to find SY. When DJS proposed to SZ, SY and WYF were already engaged and have moved into his apartment.
The other episodes they're not 'officially together' but their chemistry is off the charts so they're just as sweet.