warmblue has a long translation thread of an exchange between Wendy and Son Taejin on SBS Youngstreet.
Talking about <Be Deep>
Wendy: When I first received the song [demo], the version already had Son Taejin-nim’s voice recorded. And I thought, my voice is going to be added onto such beautiful voice and such beautiful song!?
Son Taejin: It was the opposite - for me on the contrary, I thought that if Wendy sang it, that’s just perfect
Son Taejin: Honestly, I wouldn’t know what it [the end product] would be like until you recorded, but you exceeded my expectations. I’m speaking from my heart. I was there with the two from MeloMance when you recorded - and we were out there [of the recording booth] clapping and letting out breathes of satisfaction. I’m serious!
Wendy: You even came to see me record even though you had a schedule. Although it was only 5 minutes, you came although you only had such little time to spare, I was so thankful
Son Taejin: I had no choice but to go, THE Wendy came.
Son Taejin: In my stance, of course I must go and listen.
Son Taejin: I never sang <Be Deep> in any other broadcasts even when they requested, because I wanted YS to be the first time. I’ve been saving it for this day.
Son Taejin: Honestly, to talk about the recording process, it ended very quickly
Wendy: No…
Son Taejin: No it really did end very quickly. Also, the atmopshere in recording booths are usually very sensitive for everyone
Wendy: Really? I felt very good though?
STJ: But you were so bright, so we just admired
Wendy: No no. I really like recording. I personally felt that I took quite long though
STJ: No not at all! On the contrary, it seems like you’re a perfectionist, so you weren’t satisfied with yourself. I felt that you sang really well.
Wanso: I feel like listening to a Christmas carol after listening to <Be Deep>
Son Taejin: By the way, I really like Wendy’s Christmas carol. <Have Yourself A Merry Little Christmas>. It’s really wow.
Son Taejin: I actually imagined how it [end result of Be Deep] would be like while listening to that song. You kinda have a Disney-like voice, and I thought that would really fit very well. <Be Deep> really does seem like a carol song too, fit for winter.
Son Taejin: What surprised me was, while recording, I wondered if what I was hearing is really live, or they’re just playing the recorded audio. I mean, although there’s no harm to compliment, what I said is really from the bottom of my heart.
Talking about Christmas carols:
Wendy: If you have some free time this Christmas, would you by any chance, be able to come to YS and sing some duet carols with me?
Son Taejin: I can even cancel all the schedules that I have