First off: Happy New Year, everyone!
Just like the past 2 years, I am making a ‘Year in Review’-like post featuring all the important events for f(x) and Sulli in the year of 2015.
You can check out the previous ones here. (Note: some of the pics aren’t working because there are some problems with Minus, the site I uploaded them to)
Note: I mentioned what I personally considered more important. If you want to see more, you can check out our archives. (on the sidebar)
January
SM Hologram Musical ‘School OZ‘ featuring Luna starts shows at the COEX Artium
Luna and Sulli attend the opening event for the SMTOWN Coex Artium
Victoria starts filming Chinese drama ‘Beautiful Secret‘
Amber appears on the second female special of MBC ‘Real Men’ and becomes famous with her ‘Forget it’ line
Victoria started filming ‘Noonas Over Flowers’ in Turkey
Krystal is selected as the new Bausch+Lomb model
February
Amber makes her solo debut with mini album ‘Beautiful’
Luna wins another gold medal at the MBC Idol Championships
Amber and Luna perform ‘Shake That Brass’ together
March
Victoria hosts the Hunan TV Lunar New Year Gala
Luna casted as the lead in web drama ‘Jumping Girl’
‘Noonas over Flowers’ with Victoria airs
Sulli has her first magazine shoot since hiatus
Victoria, Amber, Luna and Krystal attend SMTOWN in Taiwan
Krystal opens a new Instagram account
April
W Korea releases a short movie featuring Krystal
Luna appears on MBC ‘Mask King’ and is praised for her singing talent
f(x) wins ‘Best Group’ at the V-Chart Awards
Amber and Luna perform at the ‘Fashion Passion’ Event in Brazil
f(5) participate in UNICEF’s charity doll auction event
Krystal is selected as the new model for shoe brand Keds
May
f(4) reunite for a Baskin Robbins CF shoot
Luna casted as the female lead in children movie ‘Thunderman’s Secret’
Luna releases single ‘미소를 띄우며 나를 보낸 그 모습처럼 (Don`t Cry For Me)’ from MBC Mask King
f(4) release their Baskin Robbins CF
Sulli’s Cosmopolitan shoot in Bali is released
Victoria models for Adidas
Krystal wins the Popularity Award at the 2015 Baeksang Arts Awards
June
Victoria attends the ‘Beautiful Secret’ press conference
Victoria models for Tencent
Amber stars in her first Chinese variety show, ‘Top Fly’
Krystal is selected as the new model for White
Amber and Luna perform at 2015 Ultra Korea, releasing single ‘We Own The World’ with David Oh
Amber models for Talent Cosmetics
July
Amber, Luna and Krystal attend SMTOWN in Tokyo
Luna stars in new musical, ‘In The Heights’
Amber MCs ‘A Song for You’ Season 4
Amber opens a Youtube channel, What the Pineapple
f(4) release another Baskin Robbins CF
Victoria starts filming for Chinese remake of ‘My Best Friend’s Wedding’
f(x) release a Japanese album, ‘Summer Special Pinocchio / Hot Summer’
f(3) attend SMTOWN in Osaka and hold a special event for their Japanese release
August
Sulli officially leaves f(x), to pursue acting
f(x) perform at the London Korean Festival
Victoria casted as female lead in Chinese drama ‘Ice Fantasy’
Krystal is chosen as the Korean Tourism Ambassador
One week after the start of our support project, Sulli opens a public Instagram account
https://instagram.com/p/6wuSXgRESc/
SM Releases ‘SMTOWN The Stage’
f(3) attend AVEX A-Nation
September
f(x) celebrate their 6th anniversary
Sulli makes her first public appearance since leave
Sulli attends New York Fashion Week
Amber releases special self-made MV for ‘Beautiful’
f(x) hold their 1st Mini Concert for Tencent
October
Krystal casted in a new Chinese movie
f(x) makes their 1st comeback as 4 members with ‘4 Walls’
Sulli shows support for f(x)’s comeback
SM announces f(x)’s 1st solo concert
Krystal models for GAP
Amber, Luna, Krystal and Sulli attend the SM Halloween party
November
f(x) gets an emotional 1st place win on M Countdown
f(x) stars in new web show, ‘f(x)=1cm’
‘4 Walls’ promotions wrap up after 3 weeks
https://instagram.com/p/-G5IeYCoED/
You can check out their activities in the October and November archives
December
f(3) attend the 2015 Mnet Asia Music Awards and win the Global Fans’ Choice (Female) Award
f(x) win the Music Award of the Year and Victoria wins the Popularity Award at the iQIYI All-Stars Carnival
Krystal wins the ‘Realway Look’ award at the 2015 Fashion Star Awards
f(x) 1st Concert details announced, ticketing takes place
Sulli models for the Swarovski Winter Collection
Victoria releases her first OST for ‘Beautiful Secret’
f(x) releases special Christmas single ‘2시 25분 (Wish List)’ as part of SMTOWN Winter Garden
‘Beautiful Secret’ premieres on Hunan TV
Victoria is awarded at the 2015 Sohu Fashion Awards
Victoria releases her second ‘Beautiful Secret’ OST
Luna performs with Ailee, Solar and Jung Eunji at the SBS Gayo Daejun
Amber performs at the 2015 Super Model Competition
Sulli casted in movie ‘Real’ as supporting female
f(x) Gets An Additional Date for Their 1st Concert
Amber wins Best Variety Newcomer (Female) at the MBC Entertainment Awards
f(♥) 
I read this with full of emotion :”) I wanna smile, scream, and cry at the same time.
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Krystal & f(x) weren’t together most of the year but when they were they were the ultimate best in the world of Kpop. Each member has many individual careers that constantly keep them busy. I follow my beautiful Idol Krystal most of the time buut try to keep abreast of what the others are doing. 2015 was a great year for all the member and f(x) really shined with their 4 Walls Album & promotion. 2015 was A Great Year for f(x), Victoria, Amber, Luna & Krystal ❤️