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Sooyoung was the mc for SHINee's 1 of 1 comeback showcase
Minho was mc-ing for SNSD-TTS "Holler"comeback showcase
Taeyeon was mc-ing for Key's "Face" debut showcase
SNSD came to support SHINee's Everybody promotion at Music Bank
Minho and Key came to support SNSD's concert "Girls & Peace" in 2013
Taeyeon attended Taemin's off sick encore concert and wore the official merch 
backstage pic during Seohyun's Don't Say No debut stage @ M!Countdown, Key gave her support
Taemin and Sooyoung filming Dating Agency: Cyrano drama together
Taeyeon and Seohyun came to support SHINee at SWC V in Seoul 2016
Tiffany and Key supporting Taeyeon's debut album "I"
SNSD x SHINee at SMTOWN Halloween party in 2014
SNSD x SHINee at SMTOWN Halloween party in 2015
Sooyoung mc-ing for Jonghyun's debut showcase
Taemin guesting on Sunny's FM Date radio during Danger era <3
Taeyeon and YoonA came to support SHINee's From Now On concert @ Tokyo Dome, Japan
Key and Jonghyun came to support Taeyeon's Persona solo concert in 2017
Taeyeon guesting on Jjong's Blue Night radio in 2014 & 2017
Minho and Onew @ Taeyeon's Chin Chin radio (2009)
Taemin and Sunny as voice actors for animated movie "Koala Kid (The Outback)"
Key posing SNSD's Party signature move with YoonA and Tiffany
Choi Siblings for Coach in New York
SHINee x SNSD in Julette - Genie era
Key (ToHeart promo) during SNSD's Mr. Mr encore
Key with Hyoyeon and Yuri @ SMTOWN concert backstage <33
Key and Tiffany's Bang Bang collab stage
Taeyeon, Minho, and Taemin came to support Jonghyun's - X - Inspiration concert
more fangirl Taeng and fanboy Ming on Jonghyun's concert <3
@ I AM Movie Showcase
Jongtaeng
our beautiful mcs of our beautiful boys' solo debuts
Tiffany and Yuri doing SHINee's Lucifer signature pose
Key attended Taeyeon's The Unseen concert this year :D
Taeyeon and Key who got much closer through UMF Korea in 2014 
Jonghyun and Minho supporting SNSD's I Got A Boy comeback stage at Inkigayo
Minho the only SNSD's boyfriend ever <333
HYOKEY
Minho SNSD's favorite boy
when u meet someone who share the same braincells as you #HyoKey
supporting maknae seohyun at her first agit concert
Key and Tiffany attending Seoul Fashion Week 2015
Minho came to support SNSD's 10th yr anniv comeback stage
there are a loooot more i dont think i would post every single of their moments but i would just post some of them <3 feel free to reply if you have more shinee x snsd moments to post^^
Hyoyeon n Taemin praising each others dancing skills/performances during Hit The Stage press con.
Hyoyeon chose Taemin as the winner candidate "i was 'WOW' when i watched his stage", Taemin replied by praising Hyoyeon dances better than pro dancers ever since trainee days
Hyoyeon chose Taemin as the winner candidate "i was 'WOW' when i watched his stage", Taemin replied by praising Hyoyeon dances better than pro dancers ever since trainee days
in case of collab stages you can find more on this thread https://twitter.com/taembrat/status/1269152253446770690?s=20
Key as "Namja Taeyeon"
taengkey @ SWC V Seoul backstage they're so cute
Minho came to support Taeyeon's 'S...one concert with YoonA <3
Minho and Taeyeon joke around like siblings+Minho promoting Taeyeon's I album
Taeyeon came to Minho's Jangsari movie premiere
Minho sent flowers to Taeyeon's fanmeeting
“Victory! This is Private Choi Minho from the Marines!
I am supporting Taenggoo noona’s fanmeeting as a Marine representative!“ (cr: iheartshinee_)
Taeyeon wrote on her caption: "Minho-ya saranghae"
“Victory! This is Private Choi Minho from the Marines!
I am supporting Taenggoo noona’s fanmeeting as a Marine representative!“ (cr: iheartshinee_)
Taeyeon wrote on her caption: "Minho-ya saranghae"
Tiffany's iconic "not you, these cuties" 
at seohyun's first agit/solo concert backstage, the whole shineeshidae supporting system <33
Key fanboying Taeyeon's Time Lapse xD
Just Jjong and Yuri messing with each others
Minho dancing to Hyoyeon's Wannabe during smtown seoul rehearsal
@ smtown after party
there was a grandma taemin fan and yuri told her "he's my friend, company colleague". yuri also handed her shinee signed tsol album
SHINee singing Gee in front of Taeyeon
Jjong and Minho came to Tiffany’s bday party with SNSD
Tiffany took a candid pic of Minho’s abs during smtown concert was iconic
remember this FA!!!
Key guesting on Tiffany's show, Heart-a-tag+SHINee supporting her<3 they discussed about SHINee's fashion style on the show. Tiffany also praised SHINee for having such a cool attitude
