EXO's Chen gave fans a surprise by announcing his comeback last week. 

On 8 October, EXO revealed the news via their official social media channels that Chen, whose real name is Kim Jong-dae, will be returning with a new solo single ‘Hello’. The track is slated for release on 15 October. 

CHEN 첸 Digital Single [안녕(Hello)]

🎧 2020.10.15. 6PM (KST)
👉 https://t.co/nMsJxwzCFS#첸 #CHEN#엑소 #EXO #weareoneEXO#안녕 #Hello pic.twitter.com/CuUC2SLlPi

— EXO (@weareoneEXO) October 8, 2020

UPDATE (10/12): EXO's Chen just unveiled the stunning new teaser photos for 'Hello'. 

CHEN 첸 Digital Single [안녕(Hello)]

🎧 2020.10.15. 6PM (KST)
👉 https://t.co/nMsJxwi1hi#첸 #CHEN #엑소 #EXO #weareoneEXO #안녕 #Hello pic.twitter.com/bIGBMIgFNF

— EXO (@weareoneEXO) October 11, 2020

CHEN 첸 Digital Single [안녕(Hello)]

🎧 2020.10.15. 6PM (KST)
👉 https://t.co/nMsJxwi1hi#첸 #CHEN #엑소 #EXO #weareoneEXO #안녕 #Hello pic.twitter.com/vzU2LQe0pq

— EXO (@weareoneEXO) October 11, 2020

CHEN 첸 Digital Single [안녕(Hello)]

🎧 2020.10.15. 6PM (KST)
👉 https://t.co/nMsJxwi1hi#첸 #CHEN #엑소 #EXO #weareoneEXO #안녕 #Hello pic.twitter.com/k32R0GyVFe

— EXO (@weareoneEXO) October 11, 2020

CHEN 첸 Digital Single [안녕(Hello)]

🎧 2020.10.15. 6PM (KST)
👉 https://t.co/nMsJxwi1hi#첸 #CHEN #엑소 #EXO #weareoneEXO #안녕 #Hello pic.twitter.com/JhilzS45me

— EXO (@weareoneEXO) October 11, 2020

The upcoming fall track marks the third time Chen will be working with composer Kim Jae Hwi, following their previous collaborations on 'Flower' and 'My Dear'. 'Hello' is also described to be a heartwarming Brit Pop song with lyrics that are inspired by wishing peace on others' wellbeing. 

🎼 '안녕 (Hello)'

유니크한 분위기의 브릿 팝 곡으로, 편지를 모티브로 한 가사에는 상대방의 안녕을 바라는 마음을 덤덤하게 담았으며, 첸의 감미로운 보컬이 곡의 매력을 배가시킨다.

The unique Brit Pop song, with a letter motif, depicts the wish for the other's wellbeing in its lyrics.

— EXO (@weareoneEXO) October 12, 2020

On 13 October, the music video teaser for 'Hello' was released. 

UPDATE (15/10): Chen finally dropped the highly-anticipated solo single 'Hello' along with a new music video that tugged on our heartstrings. Watch below. 

Countless fans were touched by the music video and showed their support via Twitter. 

i cried all throughout the song... but this..... this part...... i am.... shattered..... devastated...... broken...... #CHENHelloSingle#HelloDearCHEN#안녕_종대의_다정한_인사#첸 #CHEN @weareoneEXO pic.twitter.com/oqkppfCerW

— hello, alexa🌼 (@pengkyoongin) October 15, 2020

I can't stand it, the song's so beautiful, and the subtitle's not helping - it's making me tear up even more😭😭😭😭😭😭😭😭😭#HelloDearChen #CHENHelloSingle #안녕_종대의_다정한_인사 #CHEN @weareoneEXO

— 🌅Hello DoWithlove💚 (@DOwithlovexoxo) October 15, 2020

Guess who's crying like a fool right now#HelloDearCHEN #Chen
@WeareoneExo pic.twitter.com/8MlWryyZDp

— 𝑵𝒖𝒔 || Hello by Chen (@sehunsvine) October 15, 2020

i'm crying. his song is so beautiful. it has a very great meaning and I just can't help but to cry. the way he used the word 'hello'. the lyrics made me sob as I was reading them. i'm just omyghosh it's so great . pic.twitter.com/gZro5PoJaO#CHENHelloSingle#HelloDearCHEN#CHEN

— Ky | HunHan & ChanBaek AU | Semi IA (@BaekYeolAU614) October 15, 2020

The new single comes after his last release, Dear My Dear, the second mini-album which came out last year and debuted at No.1 on the physical album charts. He also recently contributed to the OST for K-drama Do You Like Brahms?, with his song ‘Your moonlight’.

With Chen tying the knot and welcoming a daughter earlier this year, fans have speculated the meaning behind the single's cover art.

The poster is Chen carrying his daughter and the name SINGLE Hello means he welcomes his daughter okay guys i’m crying right now jongdae the perfect father😭❤️#HelloCHEN #Chen #Jongdae #첸 @weareoneEXO #EXO #엑소 pic.twitter.com/6bPaR5lKAG

— Atheer | 아티르 (@YourSongHann) October 8, 2020

there's a little girl at the back😭 he's carrying his daughter😭#CHEN#ChenHello pic.twitter.com/khKTPxjXbn

— babybunny (๑•́ ₃ •̀๑) (@exopimple) October 8, 2020

While Chen is preparing for his comeback, EXO's Lay just launched his own entertainment agency, while Baekhyun and Kai, are busy with the recent release of SuperM's debut album.