When KAI released his debut album.
One of the most popular and respected and admired individual, Kai, Also known as Idol of Idols.
It truly changed the game. Everything about that album screaming HIGH QUALITY.
From photoshoot, concept, storytelling, music, arrangement of tracks, Production, mixing, He made sure, he gave us a debut to remember.
8 years into his career, no solo station song, no solo song released (ICU/Confession/Deep Breath/ Spoiler don't count since they are in either live albums or performed in concerts only), the wait was worth it.
A highly successful debut.
He released so much content with lots of variety show appearances. I like that, he made all this effort and the effort is surely paying off.
I hope he continues to release music with such quality and I am sure he will do well.
Also, If you're curious about the title,
Go on Twitter and Search Kai's album, you will literally see thousands of tweets from Non-fans praising his work ( Majority of EXO-Ls call him by his real name JONGIN rather than KAI)
Plus his album was fantastic. 
I'm understanding 
