Posted first by JEJUair’s different countries facebooks then on Official TVXQ! Website, a “TVXQ! Welcome Back Party : The Chance of Love” showcase was announced!

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EDIT:

Also tweeted by @TVXQ:

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TVXQ! Welcome Back Party 
The Chance of Love

Date/Time:  2018.03.28 (Wed) at 8PM (KST)
Venue: I’Market Hall at Blue Square (블루스퀘어), Itaewon, Seoul
Applicants: Limited to HOTTRACKS Purchasers and JEJUair ticket buyers

HOTTRACKS lottery:

Total: 1,100 people

Buy the album and leave a comment to participate in the event during the eligibility period via this link: here (Limited to residents of Korea)
Eligibility period: 2018.3.16 (18:00) ~ 2018.3.22 (23:59)
Winners announced on 2018.3.23 at 17:00

Foreigner customers can only buy the TVXQ album on the following website: http://www.11st.co.kr/html/main.html
It seems to work as follows:
For i-fans in Korea or who’ll be in Korea during the comeback. For a chance at the showcase, buy TVXQ’s album THE CHANCE OF LOVE through this link: here. Enter hotel address; no overseas delivery), then leave comment with order no./ name / phone / birthday YYMMDD

Tickets are limited to one per person. No duplicates!
Identification is needed and winner him/herself must attend; no substitutes (overseas passport or ID OK).

Entry on the event day closes at 7:30PM / winners won’t be individually contacted.

JEJUair lottery:

Total:
KR JEJUair: 100
JP JEJUair: 100
TH JEJUair: 2
TW JEJUair: 2

Check out the posts for each page on applicatio  procedure; winner announcement through official facebook page on same day and time as HotTracks’s

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Credits:

TVXQ! Official Website and HotTracks via @snxy: here, here and here,
and JEJUair Facebook (Jeju air): here via @0206yhken,
Post Written and Shared by TVXQ! Express