Make marinade:

Combine sugar, soy sauce and wine (optional) in a medium bowl. Mix thoroughly till sugar dissolved and set aside.

Cut fresh salmon into 4 even pieces. Put them in another medium bowl. Pour 2/3 of the marinade over the salmon. Let it stand for 20 minutes. Turn salmon pieces over every 5 minutes if you want.

Slice the garlic and set aside.

Heat a heavy-bottomed skillet pan over high heat for about 2 minutes. Add oil to pan and swirl to coat. When oil shimmers (but does not smoke), add fillets skin side down and cook, without moving fillets about 30 seconds. Reduce heat to medium-high; Cover the pan with a lid; Continue to cook until skin side is well browned, about 4 minutes.

Turn fillets and cook, without moving them. Pour the rest of marinade over fillets evenly. Add sliced garlic in the pan and cover it with the lid. Let the pan cook for 3 minutes.

Remove fillets from pan to a plate. Pour the sauce (including cooked garlic) in the pan over fillets. Garnish with chopped scallion or cilantro. Serve.