You could initially start with [name_m]Drew[/name_m] as a baby step into your journey. To test the waters a bit rather than diving in head first. I do see [name_m]Drew[/name_m] as a very gender neutral name
[name_m]Andrew[/name_m] means strong and manly, looking solely at the meaning strong you could go with
[name_m]Beren[/name_m] (bear-en) meaning strong, clever
- Could go by nickname [name_m]Bear[/name_m] or [name_m]Ren[/name_m]
[name_m]Valens[/name_m] (vay-lenz or val-ens) meaning strong, vigorous, healthy
- Could go by nickname (nn) [name_m]Val[/name_m], [name_m]Len[/name_m], Lenny/Leni
[name_m]Auron[/name_m] which is similar in look and sound to Aaron/Erin and means exalted, strong
If you could find a meaning to Hyun-Shik you could possibly find a name with a similar meaning to have the connection to that. But searching names that look similar to it you could use
[name_m]Hyde[/name_m] (hide - not the best meaning I know)
[name_m]Hy[/name_m] (life) or [name_f]Hye[/name_f] (wisdom, intelligence)
[name_f]Juno[/name_f] (queen of the heavens)
[name_m]Munro[/name_m] (mouth if the [name_m]River[/name_m] [name_f]Ro[/name_f] - also [name_f]Ro[/name_f] as a nn)
[name_m]Shi[/name_m] (season, honest, history, stone)
[name_m]Shai[/name_m] (gift)
[name_f]Shay[/name_f] (stately, gift)
Shiloh/Shilo (tranquil)
[name_m]Silo[/name_m] (of the forest, or prayed for)
[name_m]Robin[/name_m] means bright fame so again with similar meanings you could do
[name_m]Albie[/name_m]
[name_m]Bright[/name_m] or [name_m]Brighton[/name_m]
[name_m]Callahan[/name_m] (nn [name_m]Cal[/name_m], [name_f]Calla[/name_f], Han)
Cyan/Cyane (sy-an) could go by [name_m]Cy[/name_m] (meaning sun)
[name_m]Eilo[/name_m]
Fynn/Finn
Laine/Lane
Neave/Neeve/Nev
[name_f]Nell[/name_f]
If you liked [name_m]Robin[/name_m] because it was an animal/nature name other options could be
[name_m]Aire[/name_m] (air)
[name_m]Alder[/name_m] (alder tree)
Anoa (small wild ox and similar to Noah/Noa)
[name_f]Ashby[/name_f] (ash tree farm)
[name_m]Bayou[/name_m]
[name_m]Clay[/name_m]
[name_m]Eldon[/name_m] (sacred hill)
Gray/Grey or the longer Grayson/Greyson (mean son a bailiff/steward)
[name_f]Lark[/name_f] (bird name)
[name_m]Oleander[/name_m] (type of shrub, could go by nn Ollie/Olly/Lee/Leander/Anders)
[name_m]Peregrine[/name_m] (meaning traveler - falcon - nn Pear/Per/Perry)
[name_m]Poe[/name_m] (peacock)
[name_m]Rowan[/name_m] (Rowan tree - nn Rowe)
Shore/Shor
[name_m]Willoughby[/name_m] (farm near the willows - nn Will/Willy/Willow/Lo/Lowe/B/Bee)
[name_f]Wren[/name_f] (small bird)
Other gender neutral names I like are
[name_m]Alden[/name_m] (old, wise friend)
[name_m]Asher[/name_m] (fortunate, blessed, happy one)
[name_m]Auden[/name_m] (old friend)
[name_m]Beau[/name_m] (beautiful/handsome) or [name_m]Bo[/name_m] (to live)
[name_m]Diem[/name_m] (day - Carpe [name_m]Diem[/name_m] from Dead Poet’s Society)
[name_m]Emerson[/name_m] (son of [name_f]Emery[/name_f] - nn Em/Emme/ Emmy/Sonny/Sunny)
[name_m]Emrys[/name_m] (immortal)
Greer/Grier (watchful)
[name_m]Hutton[/name_m] (ridge, enclosure)
Judah/Jude (praised)
[name_m]Kai[/name_m] (sea)
[name_m]Locke[/name_m] (enclosure, fortified place)
[name_m]Osias[/name_m] (salvation - nn Osi/Ossi/Si/Sias/Silas)
Quill/Quillo (scribe, writer, crossing swords, strong)
[name_f]Revel[/name_f] (rejoice)
[name_m]Rome[/name_m]
[name_m]Seeley[/name_m] (blessed, happy)
Sonny/Sunny
[name_m]Soren[/name_m] (stern)
[name_m]Sumner[/name_m] (summoner)
[name_f]Sutton[/name_f] (from the southern homestead)
Tullen (solidarity - nn [name_m]Tully[/name_m] like Sully)
[name_m]Valor[/name_m] (virtue name - honour and bravery)
I’m sure I gave you way more than you needed but I hope something in this helps you find the name you’re looking for